| ! | # | $ | ) | 0 | 1 | 2 | 3 | 4 | 6 | 7 | 8 | 9 | @ | S | _ | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z | ~ | Ѓ |

[ ! ]

.!!!	Usually README file

[ # ]

.###	Temp file (QTIC)
.#24	Printer data file for 24 pin matrix printer (LocoScript)
.#ib	Printer data file (LocoScript)
.#sc	Printer data file (LocoScript)
.#st	Standard mode printer definitions (LocoScript)

[ $ ]

.$$$	Temporary file
.$00	Pipe file (DOS)
.$1	ZX Spectrum file in HOBETA format
.$db	Temporary file (dBASE IV)
.$ed	Editor temporary file (MS C)
.$ln	TLink response file (Borland C++)
.$o1	Pipe file (DOS)
.$vm	Virtual manager temporary file (Windows 3.x)

[ ) ]

.)2(	LHA archiver temporary file (LHA)

[ 0 ]

.0	Compressed harddisk data (DoubleSpace)
.000	Common filename extension (GEOS)
.000	Compressed harddisk data (DoubleSpace)
.001	Fax (Hayes JT FAX) (many)
.075	75x75 dpi display font (Ventura Publisher)
.085	85x85 dpi display font (Ventura Publisher)
.091	91x91 dpi display font (Ventura Publisher)
.096	96x96 dpi display font (Ventura Publisher)
.0b	Printer font with lineDraw extended character set (PageMaker)

[ 1 ]

.1	Unformatted manual page (Roff/nroff/troff/groff)
.10x	Bitmap graphics (Gemini 10x printer graphics file)
.15u	Printer font with PI font set (PageMaker)
.1st	Usually README.1ST text

[ 2 ]

.24b	Bitmap graphics (24bit data)
.2gr	VGA graphics driver (Windows Video grabber)

[ 3 ]

.301	Fax (Super FAX 2000 - Fax-Mail 96))
.386	Virtual device driver (Windows 386 enhanced mode)
.3dm	QuickDraw 3D Metafile (QuickDraw)
.3dmf	QuickDraw 3D Metafile (QuickDraw)
.3ds	Graphics (3D Studio)
.3fx	Effect (CorelChart)
.3gr	VGA graphics driver (Windows Video grabber)
.3t4	Binary file converter to ascii (Util3)

[ 4 ]

.4c$	Datafile (4Cast/2)
.4md	Musical file
.4sw	Swap file (4DOS)
.4th	Forth language source code file (ForthCMP - LMI Forth)

[ 6 ]

.668	Music (the mixing is always at 12048Hz)
.669	Music (8 channels MOD) (The 669 Composer)
.6cm	Music (6 Channel Module) (Triton FastTracker)

[ 7 ]

.75	75x75 dpi display font (Ventura Publisher)

[ 8 ]

.8	Assembly language source code file (A86)
.85	85x85 dpi display font (Ventura Publisher)
.8cm	Music (8 Channel Module) (Triton FastTracker)
.8m	Printer font with Math 8 extended character set (PageMaker)
.8med	Music (Amiga OctaMed)
.8svx	Sound (Amiga 8-bit)
.8u	Printer font with Roman 8 extended character set (PageMaker)

[ 9 ]

.91	91x91 dpi display font (Ventura Publisher)
.96	96x96 dpi display font (Ventura Publisher)

[ @ ]

.@@@	Screen files used in installation or instructions

[ S ]

.S	Assembly language source code file.S for cpp (Unix)

[ _ ]

.___	Table (Adinf)

[ a ]

.a	Ada language source code file
.a	Assembly source code (Macintosh)
.a	Object library (unix)
.a11	Graphics (AIIM)
.a8	Alpha channel image data (24bit 3D animation) (Cubicomp PictureMaker)
.ab6	Datafile (ABStat)
.ab8	Datafile (ABStat)
.abc	Document (ABC FlowCharter 1.0)
.abc	General filename extension (ABC programming language)
.abc	Musical notation language file (folk melodies)
.abf	Adobe Binary Screen Font (Adobe Software)
.abk	Automatic backup (CorelDraw)
.abk	Avigo Backup (Avigo)
.abm	Image PALS album file
.abr	Adobe Brush file (Adobe PhotoShop)
.abs	Abstracts (info file)
.abs	Data file (Abscissa)
.ac$	Spooled plot file (AutoCAD AutoSpool)
.aca	Project (Project Manager Workbench)
.acad	AutoCAD database file
.acb	Archive (ACB)
.acb	Graphics (ACMB)
.acc	Program (DR-DOS - ViewMax) (GEM / resident)
.acf	Adobe Custom Filter (Adobe PhotoShop)
.acgi	ACGI Script (WWW)
.acl	Keyboard accelerator (Corel Draw 6)
.acm	Audio Compression Module add-on (Windows)
.acm	Graphics file (ACMB format)
.acmb	Graphics file (ACMB format)
.aco	Adobe Color Palette
.acr	Bitmap graphics (ACR-NEMA medical image file)
.act	Actor source code file (Graphics cell) (Animation Works)
.act	Color table (Adobe Photoshop)
.act	Foxdoc Action Diagrams (FoxPro)
.act	Presentation (Action!)
.acv	Compress and decompress audio data (OS/2 driver)
.ad	Screensaver (AfterDark)
.ad2	ADPCM 2-bit compressed voice file (ZFAX)
.ad3	ADPCM 3-bit compressed voice file (ZFAX)
.ada	Ada language source code file
.adb	Ada Package Body
.adb	Appointment database (HP 100LX organizer)
.adc	Bitmap graphics (16 colors) (ScanStudio)
.adc	Dictionary (Lingvo)
.adc	Sound (TI/MIT ADC format)
.add	OS/2 adapter device driver used in the boot process
.adex	Bitmap graphics (ADEX Corp. image file)
.adi	Graphics (AutoCAD)
.adl	Mca adapter description library (QEMM)
.adm	MultiModule screensaver (AfterDark)
.adn	Add-in (Lotus 1-2-3)
.adp	Setup file for fax modem interaction (FaxWorks)
.adpcm	Sound (Intel/DVI Adaptive Differential Pulse Code Modulation format)
.adr	Randomizer screensaver (AfterDark)
.ads	Ada Package Specification
.adt	Datafile for cardfile application (HP NewWave)
.adt	Dictionary (Lingvo)
.adt	Fax (AdTech)
.adv	GUS device driver (Gf166.com)
.adx	Document (Archetype Designer)
.aex	Alpha linked executable file
.aex	Armored extracted public key (PGP)
.aexpk	Armored extracted public key (PGP)
.af2	Flowchart (ABC FlowCharter 2.0)
.af3	Flowchart (ABC FlowCharter 3.0)
.afi	Truevision bitmap graphics
.afl	Font file (for Allways) (Lotus 1-2-3)
.afl	RubberFlex animation (AnimaFlex)
.afm	Adobe Font Metrics (Type 1 font metrics for font installers)
.afm	Datafile for cardfile application (HP NewWave)
.afp	Shape palette (ABC FlowCharter)
.aft	Template (ABC FlowCharter 3.0)
.afw	Workspace (ABC FlowCharter 3.0)
.agn	Agenda (Psion Series 3)
.ai	Vector graphics (Adobe Illustrator)
.aif	AIFF sound (Apple Audio Interchange Format File)
.aif	Application information file (EPOC32)
.aifc	AIFF-C sound (Apple Audio Interchange Format File with Compression)
.aiff	AIFF sound (Apple Audio Interchange Format File)
.aim	AOL Instant Message Launch (Netscape)
.aim	Asm Text Mode Image File (The Ultimate Draw)
.ain	Compressed file archive (Ain)
.aio	APL file transfer format file
.air	Automatic image registration
.ais	Array of Intensity Samples graphics (Xerox)
.aix	Datafile for cardfile application (HP NewWave)
.al	Sound (ALAW format)
.alb	Graphics album (JASC Image Commander)
.alg	Activity Log (ARCSOLO)
.alias	Bitmap graphics (24bit RGB RLE) (Alias image file)
.all	Arts & Letters Library (Symbol and font files)
.all	Filelist of all files (FRQView)
.all	Format file for working pages (Always)
.all	General printer information (WordPerfect for Win)
.alo	Almanac support file
.alpha	Bitmap graphics (raw alpha bytes)
.als	Bitmap graphics (24bit RLE) (Alias - Vivid RayTracer)
.alt	Menu file (WordPerfect Library)
.amf	Music (Advanced Module Format)
.amg	Compressed file archive (AMGC)
.amg	System image file (Actor)
.ams	Adobe Monitor Setup calibration file (Adobe PhotoShop)
.ams	Music format
.anc	List of pattern colors (Canon Computer Pattern Maker)
.ani	Animated cursor (Windows 95/NT)
.ani	Animation (Presidio - many)
.anm	Animation (Deluxe Paint Animator)
.ann	Help Annotations (Windows 3.x)
.ans	Animation (graphics or text)
.ans	Ascii text with ANSI character set (NewWave Write)
.aol	America On-Line related file
.aos	Installable program (Nokia Communicator add-on software)
.ap	Compressed Amiga file archive (Whap)
.ap	Datafile (Datalex EntryPoint 90)
.apc	Printer driver (Lotus 1-2-3)
.apd	Aldus Printer Description (Aldus PageMaker)
.apd	Printer driver (Lotus 1-2-3)
.apf	Printer driver (Lotus 1-2-3)
.api	Adobe Printer Ink file (Adobe PhotoShop)
.api	Application Program Interface file (Adobe Acrobat)
.api	Passed parameter file (1st Reader)
.api	Printer driver (Lotus 1-2-3)
.apl	APL work space format file
.apl	Support module (Manugraphics APL products)
.app	Add-in application file (Symphony)
.app	Application object file (dBASE Application Generator)
.app	Executable application file (DR-DOS - NeXTstep - Atari - EPOC32)
.app	Generated application (FoxPro)
.apr	Employee performance review (Employee Appraiser)
.apx	AppExpert database file (Borland C++ 4.5)
.arc	Compressed file archive (ARC - PKARC - QUARK - SQUASH)
.arf	Automatic Response File
.arh	Archivers definitions file (DN)
.ari	Compressed file archive (ARI)
.arj	Compressed file archive (Robert Jung's ARJ)
.ark	ARC archive (CP/M port of ARC file archiver)
.ark	Archive (Managing your Money)
.ark	Compressed file archive (QUARK)
.arr	Arrangement (Atari Cubase)
.arr	Bitmap graphics (Amber ARR image)
.art	Bitmap graphics (B&W) (many - First Publisher - Xara Studio)
.art	Graphics (Another Ray Tracer)
.arx	Compressed file archive (ARX)
.asc	Armored encrypted file (Pretty Good Privacy)
.asc	Ascii text
.asc	Bitmap graphics B&W ASCII (GROB Graphic Object) (HP-48sx calculator)
.asd	Autosave file (Word for Windows)
.asd	Presentation (Astound)
.asd	Screen driver (Lotus 1-2-3)
.asf	Datafile (STATGRAPHICS)
.asf	Screen font (Lotus 1-2-3)
.asf	Video (Advanced Streaming Format) (WWW)
.ash	Assembly language header file (TASM 3.0)
.asi	Assembler include file (Turbo C - Borland C++)
.asic	ASIC language source code file (ASIC)
.asm	Assembly language source code file
.aso	Assembler object (object orientated) file (Turbo Assembler)
.asp	Active Server Page (HTML file with Microsoft IIS script)
.asp	Aspect language script file (Procomm Plus)
.asp	Association of Shareware Professionals note
.ast	Adobe Color Separtion table (Adobe PhotoShop)
.ast	Assistant file (Claris Works)
.asx	Video (Advanced Streaming Format) (WWW)
.at2	Auto template (Aldus Persuasion 2.0)
.atk	Bitmap graphics (Andrew Toolkit Raster Object file)
.atm	Adobe Type Manager related file
.att	Bitmap graphics (AT&T Group 4)
.au	Sound - basic 8bit ulaw compressed audio file (Sun Audio File format)
.aut	Automation (IPIX)
.aux	Auxiliary dictionary (ChiWriter)
.aux	Auxillary references (TeX/LaTeX)
.ava	Publication (Avagio)
.avb	AntiViral Toolkit Pro Bases
.avi	Audio Video Interleaved (movie) (Video for Windows)
.avr	Sound (Audio Visual Research file format)
.avs	Animation (Application Visualization System)
.avs	Bitmap graphics (AVS X image file)
.avt	Avatar-coding files (A3E)
.aw	Text document (HP AdvanceWrite)
.awa	Animation Works Accelerated movie (Animation Works)
.awd	Document (FaxView - Microsoft Fax At Work)
.awk	AWK language source code file
.awm	Animations Works Movie (Animation Works)
.aws	Data (STATGRAPHICS)
.awx	Custom application wizard

[ b ]

.b	Batch list (APPLAUSE)
.b&w	Bitmap graphics (Mono binary screen image) (1st Reader)
.b&w	Bitmap graphics (black and white) (atari - mac)
.b1n	Bitmap graphics (both mono and color binary screen image) (1st Reader)
.b30	Printer font (JLaser - Cordata) (Ventura Publisher)
.b4	Nuts and Bolts file (Helix)
.b64	Encoded file archive (ascii) (base64 MIME)
.b8	Bitmap graphics (one byte per pixel) plane two (PicLab)
.b8	Red channel image data (24bit 3D animation) (Cubicomp PictureMaker)
.b_w	Bitmap graphics (black and white) (atari - mac)
.bac	Backup
.bad	Bad file (Oracle)
.bak	Backup
.bal	Music score (Ballade)
.bar	Compressed file archive (Unix BAR archive)
.bar	Horizontal bar menu object file (dBASE Application Generator)
.bas	BASIC language source code file (QuickBASIC - GW-BASIC)
.bat	Batch file (DOS)
.bb	Database backup (Papyrus)
.bbl	Bibliographic reference (TeX/BibTeX)
.bbm	Brush (Deluxe Paint)
.bbnng	Bitmap graphics (BBN BitGraph terminal Display Pixel Data (DPD) sequence)
.bbp	Bezier surface file
.bbs	Bulletin Board System announce or text info
.bbs	Hudson-style messagebase (FTN software)
.bch	Batch process object file (dBASE Application Generator)
.bch	Datafile (Datalex EntryPoint 90)
.bck	Backup (VMS)
.bco	Outline font description (Bitstream)
.bcp	Makefile (Borland C++)
.bcs	Browse information (Windows95)
.bct	Backup dictionary (Clarion)
.bcw	Environment settings (Borland C++ 4.5)
.bdc	Dictionary (Lingvo)
.bdf	Binary update file (BUpdate)
.bdf	Bitmap Distribution Format file (font - glyph) (Adobe - X11)
.bdf	Datafile (Egret)
.bdr	Border (MS Publisher)
.bdt	Dictionary (Lingvo)
.bex	Binary extracted public key (PGP)
.bexpk	Binary extracted public key (PGP)
.bez	Bezier surface file
.bez	Outline font description (Bitstream)
.bf2	Bradford 2 font
.bfc	Briefcase (Windows 95)
.bfm	Font metrics (unix/Frame)
.bfx	Fax (BitFax)
.bg	Game (Backgammon for Windows)
.bga	Bitmap graphics (OS/2)
.bgi	Device driver (Borland Graphics Interface)
.bhx	Compressed file ascii archive (BinHex)
.bi	BASIC source code include file (Visual Basic)
.bib	Bibliography (ascii)
.bib	Database - not compatible with TeX format (Papyrus)
.bib	Literature database (TeX/BibTeX)
.bif	Binary Information File (ASCII file describing image)
.bif	Bitmap graphics (b&w Binary Image Format) (Image Capture board)
.bif	Initialization file (GroupWise)
.big	Chinese text (old version)
.big5	Chinese text (old version)
.bil	Satellite image (8bit GIS tape format) (SPOT image)
.bin	Binary file
.bin	SGI Powerflip
.bio	BIOS (OS/2)
.bit	Bitmap graphics (X11)
.bk	Faxbook (JetFax)
.bk!	Document backup (WordPerfect for Win)
.bk1	Timed backup file for document window 1 (WordPerfect for Win)
.bk2	Timed backup file for document window 2 (WordPerfect for Win)
.bk3	Timed backup file for document window 3 (WordPerfect for Win)
.bk4	Timed backup file for document window 4 (WordPerfect for Win)
.bk5	Timed backup file for document window 5 (WordPerfect for Win)
.bk6	Timed backup file for document window 6 (WordPerfect for Win)
.bk7	Timed backup file for document window 7 (WordPerfect for Win)
.bk8	Timed backup file for document window 8 (WordPerfect for Win)
.bk9	Timed backup file for document window 9 (WordPerfect for Win)
.bkp	Backup file (Write - TurboVidion DialogDesigner)
.bks	Bookself (IBM BookManager)
.bkw	Mirror image of font set (FontEdit)
.bld	Bloadable picture (BASIC)
.blg	Backup Log (ARCSOLO)
.blk	Temporary file (WordPerfect for Win)
.bm	Bitmap graphics (1bit text) (X Window BitMap)
.bm1	Game data (Apogee BioMenace)
.bmf	Graphics
.bmk	Bookmark file (Windows)
.bmp	Bitmap graphics (PC Paintbrush - many)
.bmt	Ami Pro Button (Ami Pro)
.bnk	Adlib instrument bank file
.bnr	Graphics Banner (Banner - Poster)
.bob	Bitmap graphics (BOB Image file)
.boo	Book-format (ReadIBM)
.boo	Encoded file archive (ascii) (Boo)
.boz	Compressed file archive (bzip over zip)
.bpc	Chart (Business Plan Toolkit)
.bpp	Backup application (Clarion)
.bpt	Bitmap fills file (CorelDraw)
.br	Data (Omnis7)
.br	Script (Bridge)
.brd	Eagle Layout File
.brk	Fax (Brooktrout Fax-Mail)
.brk	Mailer REXX script (The Brake!)
.brl-cad	Ballistic Research Laboratory CAD
.brush	Bitmap graphics (Xerox Doodle Brush file)
.brx	A file for browsing an index of multimedia options
.bs1	Game data (Apogee Blake Stone)
.bs2	Archive (BS2)
.bsa	Compressed file archive (BSArc)
.bsc	Browser information (MS Developer Studio)
.bsc	Compressed Apple II file archive (BINSCII)
.bsc	Database (Source Browser)
.bsc	Pwbrmake object file (MS Fortran)
.bst	BiblioTex Style (BibTeX)
.bsy	Busy flag (FTN soft)
.btl	Inmos bootable file
.btm	Batch file (Batch To Memory) (4DOS - NDOS)
.btn	Button file (Makeover)
.bub	Photobubble (IPIX)
.bufr	Binary Universal Form for the Representation
.bufr	Meteorological Data
.bug	Bugs and Problems
.bup	Backup
.but	Button definitions (Buttons!)
.bv1	Overflow file below insert point in Doc 1 (WordPerfect for Win)
.bv2	Overflow file below insert point in Doc 2 (WordPerfect for Win)
.bv3	Overflow file below insert point in Doc 3 (WordPerfect for Win)
.bv4	Overflow file below insert point in Doc 4 (WordPerfect for Win)
.bv5	Overflow file below insert point in Doc 5 (WordPerfect for Win)
.bv6	Overflow file below insert point in Doc 6 (WordPerfect for Win)
.bv7	Overflow file below insert point in Doc 7 (WordPerfect for Win)
.bv8	Overflow file below insert point in Doc 8 (WordPerfect for Win)
.bv9	Overflow file below insert point in Doc 9 (WordPerfect for Win)
.bw	Bitmap graphics (SGI image)
.bwb	Spreadsheet application (Visual Baler)
.bwr	Beware (buglist) (Kermit)
.byu	Bitmap graphics (Movie BYU format)
.bz	Compressed file archive (bzip)
.bz2	Compressed file archive (bzip2)

[ c ]

.c	C language source code file
.c	Compressed unix file archive (compact)
.c++	C++ language source code file
.c--	C-- language source code file (Sphinx C--)
.c00	Print file (Ventura Publisher)
.c4	Bitmap graphics (1bit) (JEDMICS CCITT4 format)
.c64	Bitmap graphics (Commodore 64 image file)
.c86	C language source code file (Computer Innovation C86)
.ca	Initial cache data for root domain servers (Telnet)
.ca0	Packed and splitted file (Borland Installer)
.cab	Compressed Cabinet file (Microsoft)
.cac	dBASE IV executable when caching on/off (see cachedb.bat)
.cad	Document (Drafix Windows CAD)
.cal	Bitmap graphics B&W (Computer-aided Acquisition and Logistics Support)
.cal	Calendar file (Windows 3.x)
.cal	Spreadsheet (SuperCalc)
.cals	Bitmap graphics (Computer Aided Acquisition and Logistics Support)
.cam	Graphics (Casio Digital Camera)
.can	Fax (Navigator Fax)
.cap	Caption (Ventura Publisher)
.cap	Session capture file (ProComm - Telix)
.cas	C + ASM language source (Turbo C)
.cat	Catalog (CP Backup - dBASE IV)
.cat	IntelliCharge categorization file (Quicken)
.cb	Microsoft clean boot file
.cbc	Fuzzy logic system (CubiCalc)
.cbl	Cobol language source code file
.cbm	Compiled bitmap graphics (XLib)
.cbs	Button bar configuration file (MasterWord)
.cbt	Computer Based Training (many)
.cc	C++ language source code file (gcc)
.cc	CC language source code file (cc)
.ccad	Data (ClarisCAD)
.ccb	Animated Button configuration (Visual Basic)
.ccc	Bitmap graphics (native format) (Curtain Call)
.ccf	Communications configuration file (Symphony)
.ccf	Configuration file (OS/2 Multimedia Viewer)
.cch	Chart (CorelChart)
.cci	CCITT Group 3 and Group 4 Encoding
.ccitt	CCITT Group 3 and Group 4 Encoding
.ccl	Communication Command Language file (Intalk)
.ccm	Mailbox (Lotus CC:Mail)
.cco	Btx Graphics file (XBTX)
.ccrf	Bitmap graphics (Calcomp Raster File) (B&W or 1bit CMYK for printers)
.cd	CD description (DN)
.cda	CD audio track (Windown 95)
.cdb	Card database (CardScan)
.cdb	Main database (Turbo C Utilities)
.cdf	Channel Definition Format (Microsoft)
.cdf	Common Data Format (multi-dimensional data sets)
.cdf	Cyberspace Description Format
.cdf	Graphics (Unidata netCDF)
.cdi	Bitmap graphics (Phillips CD-I IFF file)
.cdk	Document (Atari Calamus)
.cdl	CAD language file (CADKey)
.cdm	Disk Drivers NPA (Novell NetWare)
.cdm	Music format (compressed)
.cdr	Vector graphics (CorelDraw format)
.cdt	Template (CorelDraw)
.cdx	Compound index (FoxPro)
.cdx	Compressed drawing (Corel Draw)
.ce	Main.ce (The FarSide Computer Calendar)
.cef	Workbench application (CA Clipper)
.ceg	Bitmap graphics (Tempra Show - Edsun Continuous Edge Graphics)
.cel	Animation (Autodesk Animator - 3D Studio)
.cel	Bitmap graphics (15/32bit) (Lumena CEL file) (Time Arts software)
.cer	Compilation error messages (Lahey Fortran)
.cer	Internet security certificate
.cf	Configuration (imake)
.cfb	Comptons Multimedia file
.cfb	Inmos binary configuration file
.cfg	Configuration
.cfl	Chart (CorelFLOW)
.cfn	Font data (Atari Calamus)
.cfo	C Form Object file (Turbo C Utilities)
.cfp	Fax (The Complete Fax Portable)
.cfr	CFR Guidance (NRC Inspection Manual)
.cfs	Inmos configuration file
.cft	CFast graphics file (Disney Animation Studio)
.cga	CGA display font (Ventura Publisher)
.cgi	Common Gateway Interface script (WWW)
.cgl	Error log (CodeGuard)
.cgm	Vector graphics (Computer Graphics Metafile format)
.ch	Configuration file (OS/2)
.ch	Header file (CA Clipper)
.ch3	Chart (Harvard Graphics 3.0)
.ch4	Presentation (Charisma 4.0)
.cha	Chat (IRC data)
.chat	Chat (IRC data)
.chd	Font descriptor (FontChameleon)
.chi	Document (ChiWriter)
.chk	Recovered data (ChkDsk)
.chk	Temporary file (WordPerfect for Win)
.chl	Configuration History Log
.chm	Compiled HTML file
.chn	Data (Ethnograph 3)
.chp	Chapter file (Ventura Publisher)
.chr	Character set (Turbo C - Turbo Pascal)
.cht	Chart (Harvard Graphics 2.0 - SoftCraft Presenter)
.cht	Interface file for ChartMaster (dBASE)
.chz	Archive (CHARC)
.cif	Chapter information (Ventura Publisher)
.cif	Graphics (Caltech Intermediate Format)
.cif	IUCr Crystallographic Information File
.cil	Clip gallery download package (Art Gallery)
.cim	C Text Mode Image File (The Ultimate Draw)
.cim	Game data (SimCity 2000)
.cin	INI file change control file (OS/2)
.cix	Database index (Turbo C Utilities)
.ck1	Game data (iD/Apogee Commander Keen 1)
.ck2	Game data (iD/Apogee Commander Keen 2)
.ck3	Game data (iD/Apogee Commander Keen 3)
.ck4	Game data (iD/Apogee Commander Keen 4)
.ck5	Game data (iD/Apogee Commander Keen 5)
.ck6	Game data (iD/Apogee Commander Keen 6)
.ckb	Keyboard mapping (Borland C++ 4.x)
.cl	Common LISP language source code file
.cla	Source (Clarion)
.class	Java bytecode (compiled class - application)
.clb	Clipbook template (Super NoteTab)
.cld	Clipper debugger configuration file (CA Clipper)
.clp	Bitmap graphics (Clip art) (PCPaint - Pictor - Quattro Pro)
.clp	Clipboard file (Windows 3.x)
.clp	Compiler responce file (CA Clipper)
.clr	Color binary screen image (1st Reader)
.clr	Color definitions (Photostyler)
.clr	Color scheme (Boxer/2)
.cls	C++ class definition file
.cls	Class module (Visual Basic)
.clw	MFC Class Wizard information (MS VC++)
.cm	Bitmap graphics (8bit) (Unix Puzzle)
.cm	Data (CraftMan)
.cmb	Xtree for Windows Button Bar file
.cmd	Batch file (REXX) (OS/2)
.cmd	Command file (dBASE - Waffle)
.cmd	External command menu (1st Reader)
.cmf	Corel Metafile
.cmf	FM-music file (Creative Music File)
.cmk	Card (Card Shop Plus)
.cml	CML document (Chemical Markup Language)
.cmm	Cmm script (CEnvi)
.cmp	Bitmap graphics (Lead CMP compression)
.cmp	Calibration map (Photofinish)
.cmp	Compressed data (PKWare compression library)
.cmp	Data (CraftMan)
.cmp	Header file for PostScript printer files (CorelDraw)
.cmp	User dictionary (MS Word for DOS)
.cmrt	Data (CraftMan)
.cmu	Bitmap graphics (Carnegie Mellon University (CMU) Window Manager bitmap Formats)
.cmuwm	Bitmap graphics (Carnegie Mellon University (CMU) Window Manager bitmap Formats)
.cmv	Animation (CorelMove - CorelDraw 4.0)
.cmx	Vector graphics (CorelDraw)
.cmyk	Bitmap graphics (raw cyan magenta yellow and black bytes)
.cnc	CNC general program data
.cnf	Configuration (program - printer setup)
.cnm	Windows application menu options and setup file
.cnq	Shop file (Compuworks Design)
.cnv	Data conversion support file (Word for Windows)
.cnv	Temporary file (WordPerfect for Win)
.cob	Cobol language source code file
.cob	Graphics (Calgari trueSpace2 File Format)
.cod	Code definition table (UUPC)
.cod	Datafile (Forecast Plus - MS Multiplan - StatPac Gold)
.cod	Printer code definition file (Boxer/2)
.cod	Program compiled code (FORTRAN)
.cod	Source code in assembler with original C code as comments (MS C)
.cod	Template source file (dBASE Application Generator)
.cod	Videotext file
.col	Color palette (Autodesk Animator - many)
.col	Spreadsheet (MS Multiplan)
.com	Command (memory image of executable program) (DOS)
.con	Configuration file (Simdir)
.conf	Configuration information (Unix)
.coo	Cookie file
.core	Bitmap graphics (Core Software Tech CORE IDC file)
.cpc	Compressed image (Cartesian Perceptual Compression)
.cpd	Fax Cover document
.cpd	Script (Complaints Desk)
.cpe	Fax Cover document
.cpf	Fax (The Complete Fax)
.cpi	Bitmap graphics (Colorlab Processed Image)
.cpi	Code Page Information file (DOS)
.cpl	Colour palette (Corel)
.cpl	Control panel extension (Windows)
.cpl	Presentation (Compel)
.cpp	C++ language source code file
.cpp	Presentation (CA-Cricket Presents)
.cpr	Presentation (Corel Presents)
.cps	Backup of startup files (QEMM)
.cps	Color PostScript
.cpt	Bitmap graphics (Corel Photo-Paint)
.cpt	Compressed Macintosh file archive (Compact Pro)
.cpt	Encrypted memo file (dBASE)
.cpt	Template (CA-Cricket Presents)
.cpx	Compressed drawing (Corel Presentation Exchange)
.cpz	Music text file (COMPOZ)
.cra	Advanced crack file (usually text)
.crd	Cardfile (Windows 3.x - YourWay)
.crf	Bitmap graphics (Calcomp Raster File) (B&W or 1bit CMYK for printers)
.crf	Cross-reference (MASM - Zortech C++)
.crk	Crack file (usually text)
.crp	Encrypted database (dBASE IV)
.crp	Run-time presentation (Corel Presents)
.crs	File Conversion Resource (WordPerfect 5.1)
.crt	Internet security certificate
.crt	Terminal settings information (Oracle)
.cru	Compressed file archive (CRUSH)
.csc	Corel Script
.csg	Graph (Statistica/w)
.cslm	Bitmap graphics (Zeiss CSLM file)
.csm	Precompiled headers (Borland C++ 4.5)
.csp	Screen Image (PC Emcee)
.css	Cascading Style Sheet (WWW)
.css	Datafile (CSS - Stats+ - Statistica)
.csv	Adjusted EGA/VGA palette (CompuShow)
.csv	Data file (Comma Separated Values format)
.csy	Polymorphic DLL (EPOC32)
.ct	Bitmap graphics (32bit CMYK) (Scitex CT Bitmap) (Scitex scanners)
.ct	Bitmap graphics (32bit) (Iris CT format) (Iris printers)
.ctc	Control file (PC Installer)
.ctf	Character code translation file (Symphony)
.ctl	Control file (dBASE IV - Aldus Setup)
.cts	Permanent location contents (ABC programming language)
.ctx	Ciphertext file (PGP)
.ctx	Course TeXt file (Microsoft online guides)
.cube	Bitmap graphics (Cubicomp/Vertigo image file) (Cubicomp PictureMaker)
.cubi	Bitmap graphics (Cubicomp/Vertigo image file) (Cubicomp PictureMaker)
.cue	Microsoft Cue Cards data
.cuf	C Utilities Form definition (Turbo C Utilities)
.cur	Cursor image resource (Resource Workshop - Watcom Resource Editor)
.cursor	Cursor (Sun Cursor file)
.cut	Bitmap graphics (Media Cybernetic's Dr.Halo graphics format)
.cv	Archive (Corel Versions)
.cv	Information screen (Microsoft CodeView)
.cv4	Color file (CodeView)
.cvp	Cover page (WinFax)
.cvs	Bitmap graphics (Canvas drawing)
.cvt	Backup file for CONVERTed database file (dBASE IV)
.cvw	Color file (CodeView)
.cweb	C Web
.cwk	Document (ClarisWorks)
.cwl	Library (ClarisWOrks)
.cws	Stationery (ClarisWorks)
.cxx	C++ language source code file (Zortech C++, gcc)

[ d ]

-.d63	Commodore 64 emulator disk file
-.dac	Sound (TI/MIT DAC format) (byte reversed ADC file)
-.dat	Data file (ASCII or binary - many)
-.dat	Merge data (WordPerfect)
-.db	Configuration (dBASE IV - dBFast - MultiEdit)
-.db	Database (dbVista - Paradox - Smartware - XTreeGold)
-.db$	Temporary file (dBASE - Modula2)
-.db2	Database (dBASE II)
-.db3	Database (dBASE III)
-.dba	Database (Turbo Prolog - DataEase)
-.dbd	Business data (Business Insight)
-.dbd	Debug info (Clarion Modula-2)
-.dbf	Database file (dBASE III/IV - FoxPro - dBFast - DataBoss)
-.dbg	Debugger script (DOS debug - Watcom debuger)
-.dbg	Symbolic debugging information (MS C/C++)
-.dbk	Database backup (dBASE IV)
-.dbm	Datafile (DataEase)
-.dbm	Menu template (DataBoss)
-.dbo	Compiled program (dBASE IV)
-.dbs	Datafile (Managing Your Money - ProDas - SQL Windows)
-.dbs	Printer description file (MS Word - Works)
-.dbt	Database text (Clipper)
-.dbt	Foxbase+ style memo (FoxPro)
-.dbt	Memo file for database w/same name (dBASE IV - dBFast)
-.dbw	Windows file (DataBoss)
-.dbx	Graphics (DataBeam image)
-.dca	Document Content Architecture text file (IBM DisplayWrite)
-.dcf	Disk image file
-.dcl	Delphi Component Library (Borland Delphi)
-.dcp	Data CodePage (OS/2)
-.dcp	Device code page (OS/2)
-.dcr	Data (Shockwave - Macromedia Director)
-.dcs	Bitmap graphics (Quark Desktop Color Separation EPS file) (QuarkXPress)
-.dcs	Datafile (ACT! Activity Files)
-.dcs	Desktop Color Separation file
-.dct	Database dictionary (Clarion Database Developer)
-.dct	Spell checking dictionary (Clarion - Harvard Graphics 3.0 - Symphony)
-.dcu	Delphi unit (compiled) (Borland Delphi)
-.dcx	Bitmap graphics (Multipage PCX - many faxes)
-.dd	Compressed Macintosh file archive (DiskDoubler)
-.ddb	Bitmap graphics
-.dde	Dynamic Data Exchange (binary)
-.ddf	Database (BTRIEVE)
-.ddi	Disk image (DiskDupe)
-.ddif	Bitmap graphics (DEC DDIF file)
-.ddp	Device Driver Profile file (OS/2)
-.deb	Debug script (DOS Debug)
-.dec	Decoded file
-.def	Assembly header file (Geoworks Esp)
-.def	Data (SmartWare II)
-.def	Defaults - definitions
-.def	Linker definition file (TLink - WLink...)
-.dem	Demo
-.dem	Digital Elevation Model
-.dem	Graphics (VistaPro)
-.der	Internet security certificate
-.des	Description
-.desc	Description
-.dev	Device driver
-.df	Bitmap graphics (Hierarchical Data File) (NCSA)
-.dfd	Data Flow Diagram graphic (Prosa)
-.dfd	Dyadic functions (ABC programming language)
-.dfi	Outline font description (Digifont)
-.dfl	Default program settings (Signature)
-.dfm	Data Flow Diagram model file (Prosa)
-.dfm	Form file (Borland Delphi - C++ Builder)
-.dfs	Delight Sound File
-.dfv	Printing form (MS Word)
-.dfx	Micrografx Effects DLL
-.dgn	CAD drawing (vector) (MicroStation)
-.dgs	Diagnostics
-.dh	Dependency information for .ph (Geoworks)
-.dhp	Bitmap graphics (Dr. Halo PIC)
-.dht	Datafile (Gauss)
-.dia	Diagraph graphics (Computer Support Corporation)
-.dib	Bitmap graphics (Device Independent Bitmap)
-.dic	Dictionary
-.dif	Database (Data Interchange Format) (Visicalc)
-.dif	Difference data file (Patch script)
.dif	Display Information File (OS/2)
.dip	Debug info processor (Watcom Debugger)
.dir	Dialing directory file (Procomm Plus)
.dir	Directory file (VAX - CPS Backup)
.dir	Movie format (MacroMind Director 4.x)
.dis	Distribution list (VAX Mail)
.dis	Thesaurus (CorelDraw)
.diz	Description file (Description In Zip)
.dkb	Raytraced graphics (DKBTrace)
.dl	Animation (Display - DL Viewer)
.dld	Data (Lotus 1-2-3)
.dlg	Dialog resource script file (MS Windows SDK)
.dlg	Dialog resources (DN)
.dlg	Digital Line Graph
.dll	Dynamic Link Library (Windows 3.x - OS/2)
.dlm	Data (FileMaker Pro)
.dls	Setup (Norton Disklock)
.dmf	Music format (Delusion Digital Music File) (Delusion)
.dmo	Demo (Derive)
.dmp	Dump file (eg. screen or memory)
.dms	Compressed Amiga file archive (DiskMasher)
.doc	Text document (binary file)
.dog	Screen file (Laughing Dog Screen Maker)
.doh	Dependency information for .poh (Geoworks)
.dos	External command file (1st Reader)
.dos	MSDOS related file (Win95)
.dot	Document template (MS Word)
.dot	Line-type definition file (CorelDraw)
.dox	Text document (MultiMate 4.0 - MS Word)
.doz	Description Out of Zip (VENDINFO)
.dp	Calendar file (Daily Planner)
.dp	Data file (DataPhile)
.dp	Primary data file (THOR database)
.dpd	Dyadic predicates (ABC programming language)
.dpj	Project (Borland Delphi)
.dpr	Default project- and state-related information (Borland C++ - Delphi)
.dpx	Bitmap graphics (Digital Moving Picture Exchange) (Cineon DPX file)
.drs	Display Resource (WordPerfect for Win)
.drv	Device driver (for hardware)
.drw	Vector graphics (Micrografx Designer format)
.ds4	Vector graphics (Micrografx Designer 4.x)
.dsc	Description file
.dsc	Discard file (Oracle)
.dsd	Database (DataShaper)
.dsf	Delusion Digital Sound File (Delusion)
.dsk	Disk Drivers (Novell NetWare)
.dsk	Project desktop (Borland C++)
.dsm	Digital sound module (DSI)
.dsm	Macro (MS Developer Studio)
.dsn	Design (Object System Designer)
.dsn	ODBC data source
.dsp	Display parameters (Signature)
.dsp	Dynamic Studio Professional Module (Dynamic Studio)
.dsp	Graphics display driver (Dr.Halo)
.dsp	Project (MS Developer Studio)
.dsq	Query file (Corel)
.dsr	Driver Resource (WordPerfect for Win)
.dss	Screensaver file (DCC)
.dss	Sound (Digital Soup)
.dst	WAIN (Scanner spec) data source DLL (Win)
.dsw	Project workspace (Borland C++ - MS Developer Studio)
.dt_	Data fork of a Macintosh file (Mac-ette)
.dta	Data file (Turbo Pascal - PC-File - Stata)
.dtf	Database file (PFS - Q&A)
.dtp	Publication (PageMagic - Publish-It! - Publisher3)
.dvc	Data (Lotus 1-2-3)
.dvi	Text document (TeX Device Independent File Format) (TeX)
.dvp	Device parameter file (AutoCAD)
.dvp	Program information file (DESQview)
.dw2	Drawing (DesignCAD for windows)
.dwb	Workbench (Coryphaeus Software Designer)
.dwc	Compressed file archive (DWC)
.dwf	Vector graphics (CAD programs)
.dwg	Drawing database (vector) (AutoCAD - Drafix) (CAD programs)
.dx	Cross-reference data (THOR database)
.dx	Document (Data explorer)
.dx	Text file (DEC WPS/DX format - DEC WPS Plus)
.dxb	Drawing binary exchange format (vector) (AutoCAD)
.dxf	Vector graphics (Drawing Exchange Format) (AutoCAD) (CAD programs)
.dxn	Fax (Fujitsu dexNET)
.dy22	Sound (Dyaxis format) (sampling rate 22k)
.dy44	Sound (Dyaxis format) (sampling rate 44k)
.dyl	Dynamic link library (EPOC16)
.dyn	Data (Lotus 1-2-3)

[ e ]

.eas	Extended file attributes (OS/2)
.ebj	Error-checking object file (Geoworks)
.ec	Preprosessed GOC source code file (error-checking version) (Geoworks)
.ecg	Preprosessed GOC source code file (error-checking version) (Geoworks)
.edt	Default settings (VAX EDT editor)
.edt	External editors definitions (DN)
.eeb	Equation editor button bar (WordPerfect for Win)
.eer	Execution error messages (Lahey Fortran)
.efs	Flowchart (EasyFlow)
.eft	High resolution screen font (ChiWriter)
.efx	Fax (Everex EFax)
.ega	EGA display font (Ventura Publisher)
.eidi	Bitmap graphics (Electric Image EIDI file)
.eka	Internal data files (Borland's Eureka)
.el	Elisp language source code file (Emacs lisp)
.elc	Compiled ELISP code (Emacs lisp)
.eli	Archive (ELI)
.elt	Event list (Prosa)
.emf	Graphics (Enchanced Metafile)
.emu	Terminal emulation data (BITCOM)
.enc	Encoded file - UUENCODEd file (Lotus 1-2-3 - uuencode)
.enc	Music (Encore)
.end	Arrow-head definition file (CorelDraw)
.enff	Extended Neutral File Format
.eng	Dictionary engine (Sprint)
.eng	Engine routines (Matlab)
.eng	English documentation
.eng	Graphics (charting) (EnerGraphics)
.env	Data (Novell Envoy)
.env	Enveloper macro (WOPR)
.env	Environment file (WordPerfect for Win)
.eobj	Object code (error-checking version) (Geoworks)
.epd	Publication (Express Publisher)
.epi	Encapsulated PostScript (text and graphics) (Express Publisher)
.eps	Encapsulated PostScript (text and graphics) (Adobe Illustrator)
.eps	Printer font (Epson - Xerox...) (Ventura Publisher)
.epsf	Encapsulated PostScript file (text and graphics)
.epsi	Encapsulated PostScript style preview file
.epson	Epson printer graphics file
.eqn	Equation (WordPerfect for Win)
.er1	Data (ERWin)
.erd	Entity Relationship Diagram graphic file (Prosa)
.erm	Bitmap graphics
.erm	Entity Relationship Diagram model file (Prosa)
.err	Error log
.err	Error messages for command line compilers
.ers	Satellite image header (ER Mapper file) (Earth Resource Mapping)
.erx	Data (ERWin)
.esh	Extended Shell batch file
.eth	Document (Ethnograph 3)
.etx	Structure Enhanced (setext) text
.euc	Japanese text (Kanji)
.evp	Sound envelope (general purpose data curves stored as doubles) (mxv)
.evt	Event descriptions
.evt	Event log
.evy	Document (WordPerfect Envoy)
.ewd	Document (Express Publisher for Windows)
.ewl	Document (Microsoft Encarta)
.ex3	Device driver (Harvard Graphics 3.0)
.exc	Exclude file for Optimize (do not process) (QEMM)
.exc	Rexx language source code file (VM/CMS)
.exc	Text document
.exe	Directly executable program (MSDOS)
.exm	Msdos executable system-manager compliant (HP calculator)
.exp	Protected mode executable program (PharLap)
.ext	Extension file (Norton Commander)
.exx	Intermediate file by MsgPut (IBM LinkWay)
.ezf	Fax (Calculus EZ-Fax)

[ f ]

.f	Compressed file archive (Freeze)
.f	Fortran language source code file (fixed form)
.f01	Fax (perfectfax)
.f06	Dos screen text font - height 6 pixels (fntcol13.zip)
.f07	Dos screen text font - height 7 pixels (fntcol13.zip)
.f08	Dos screen text font - height 8 pixels (fntcol13.zip)
.f09	Dos screen text font - height 9 pixels (fntcol13.zip)
.f10	Dos screen text font - height 10 pixels (fntcol13.zip)
.f11	Dos screen text font - height 11 pixels (fntcol13.zip)
.f12	Dos screen text font - height 12 pixels (fntcol13.zip)
.f13	Dos screen text font - height 13 pixels (fntcol13.zip)
.f14	Dos screen text font - height 14 pixels (fntcol13.zip)
.f16	Dos screen text font - height 16 pixels (fntcol13.zip)
.f2r	Music (Farandole Linear Module format)
.f3r	Music (Farandole blocked linear module format)
.f77	Fortran 77 language source code file
.f90	Fortran 90 language source code file (free form)
.f96	Fax (Frecom FAX96)
.fac	Bitmap graphics (UNIX Faceserver image file) (Usenix FACE)
.face	Bitmap graphics (UNIX Faceserver image file) (Usenix FACE)
.fal	Bitmap graphics (image header information) (Q0 format)
.faq	Frequently Asked Questions (text file)
.far	Music (Farandole Composer Module)
.fas	Compiled program (Macsyma)
.fav	Favorites shortcut (MS Outlook)
.fax	Fax (generic Group 3 1bit encoded data) (most Fax programs)
.fbm	Fuzzy Bitmap
.fc	Spell checking dictionary (Harvard Graphics 2.0)
.fcm	Binary file patch file (forward compression) (jlpak10.zip)
.fd	Declaration file (MS Fortran)
.fd	Field offsets for compiler (DataFlex)
.fd	Resource file (Front Door)
.fdf	Forms document (Adobe Acrobat)
.fdw	Form (F3 Design and Mapping)
.feb	Figure editor button bar (WordPerfect for Win)
.fei	Fatal Error Infotable (Geoworks)
.ff	Intelligont FIAS format
.ff	Outline font description (Agfa Compugraphics)
.fff	Fax (defFax)
.ffi	Atech FastFont (AllType)
.ffivw	File Format for the Interchange of Virtual Worlds
.fft	Fast Fourier Transform analysis data
.fft	Text file (DCA/FFT Final Form Text - DisplayWrite)
.fh3	Vector graphics (Aldus FreeHand 3.x)
.fh4	Vector graphics (Aldus FreeHand 4.x)
.fi	Interface file (MS Fortran)
.fif	Graphics (Fractal Image Format)
.fig	Linker options (Lahey Fortran)
.fil	File listing
.fil	File template (Application Generator)
.fil	Files list object file (dBASE Application Generator)
.fil	Overlay (WordPerfect)
.fin	Print-formatted text file (Perfect Writer - Scribble - MINCE)
.fio	Graphics filter (Aldus PhotoStyler)
.fit	File Index Table (Windows NT)
.fit	Graphics and data (Flexible Image Transport System)
.fits	Graphics and data (Flexible Image Transport System)
.fix	Patch file
.fky	Macro file (FoxPro)
.fl	Sound (Floating format) (hardware dependant not transportable)
.flb	Format library (Papyrus)
.flc	Animation (AutoDesk FLIC format) (Autodesk Animator)
.fld	Folder (Charisma)
.fli	Animation (AutoDesk FLIC format) (Autodesk Animator)
.fli	Tex font library (EmTeX)
.flm	Film Roll (AutoCAD/AutoShade)
.flt	Data filter file (Alsud - Micrografx Picture Publisher - MS Word)
.flt	Flight file (MultiGen)
.flt	Graphics filter (Asymetrix ToolBook - Corel)
.flx	Animation format
.flx	Compiled binary (DataFlex)
.flx	Database (Flexstor format)
.fm	Database (FileMaker Pro)
.fm1	Spreadsheet (Lotus 1-2-3 release 2.x)
.fm3	Device driver (Harvard Graphics 3.0)
.fm3	Spreadsheet (Lotus 1-2-3 release 3.x)
.fmb	File Manager Button bar (WordPerfect for Win)
.fmf	Font or icon file (IBM LinkWay)
.fmk	Makefile (Fortran PowerStation)
.fmo	Compiled format file (dBASE IV)
.fmt	Format file (dBASE IV - FoxPro - Clipper 5 - dBFast - Gate3)
.fmt	Style sheet (Sprint)
.fmv	Full Motion Video file
.fn3	Font file (Harvard Graphics 3.0)
.fnd	Saved search (Windows 95)
.fnt	Font file (many)
.fnx	Inactive font (Exact)
.fo1	Font file (Borland Turbo C)
.fo2	Font file (Borland Turbo C)
.fog	Fontographer Database File (Fontographer3.5)
.fol	Folder of saved messages (1st Reader)
.fon	Bitmap font file (many - Windows 3.x font library)
.fon	Log of all calls (Procomm Plus)
.fon	Phonebook (Terminate - Terminator - Telix)
.font	Font data (unix)
.fop	Bitmap graphics (Freedom of Press)
.for	Form (WindowBase)
.for	Fortran language source code file (fixed form)
.fot	Truetype font styles file (installed font)
.fox	Foxbase executable (precompiled .prg) (FoxBase)
.fp	Configuration file (FoxPro)
.fp	Data (FileMaker Pro)
.fp1	Game data (Flying Pigs for Windows)
.fp3	Document (FileMaker Pro 3.0)
.fpc	Catalog (FoxPro)
.fpd	TMT Pascal compiled unit (TMT Pascal)
.fpt	Memo field tables (FoxPro)
.fpw	Floorplan drawing (FloorPLAN plus for Windows)
.fpx	Bitmap graphics (Kodak FlashPix)
.fr3	Renamed dBASE III+ form file (dBASE IV)
.frf	Font database file (FontMonger)
.frg	Uncompiled report file (dBASE IV)
.frl	Library (GP-Forth)
.frm	Form ie. dialog layout (Visual Basic)
.frm	Formula (Fractint)
.frm	Merge form (WordPerfect)
.frm	Order or registration form (text file)
.frm	Report file (dBASE IV - Clipper 5 - dBFast)
.fro	Compiled report file (dBASE IV)
.frp	Form (PerForm PRO Plus - FormFlow)
.frs	Screen Font Resource (WordPerfect for Win)
.frt	Additional (FPT) report description file (FoxPro)
.frt	GP-Forth language source code file (GP-Forth)
.frx	Form stash file (binary) (Visual Basic)
.frx	Main (DBF) report description file (FoxPro)
.frz	Freeze file (EPOC32)
.fs	Bitmap graphics (Usenix FaceServer file)
.fsl	Form (Paradox for Windows)
.fsm	Music format (Farandole Composer WaveSample)
.fssd	Sound
.fst	Linkable program (dBFast)
.fsx	Data (Lotus 1-2-3)
.ftm	Font file (Micrografx)
.ftn	Fortran language source code file (fixed form)
.ftp	Configuration (FTP Software PC/TCP)
.ftp	Document (FTP Voyager)
.fts	Full text search (Windows 95)
.fts	Graphics (Flex Image Transport)
.fw	Database (FrameWork)
.fw2	Database (Framework II)
.fw3	Database (Framework III)
.fweb	Fortran WEB
.fx	On-line guide (FastLynx)
.fxd	Phonebook (FAXit)
.fxp	Executable precompiled .prg (FoxPro)
.fxs	Fax Transmit Format graphics (WinFax)
.fzp	Dye Sub printing support file (Fargo Primera colour printer)

[ g ]

.g	Data chart (APPLAUSE)
.g16	Compiled config (GoldED for DOS)
.g3	Bitmap graphics (Group 3 FAX file)
.g8	Green channel image data (24bit 3D animation) (Cubicomp PictureMaker)
.g8	Raw graphics (one byte per pixel) plane three (PicLab)
.gal	Gallery (Corel Multimedia Manager)
.gam	Fax (GammaFax)
.gb	Chinese text
.gbl	Global definitions (VAXTPU editor)
.gbl	Global module in Basic programs
.gc1	Lisp language source code file (Golden Common Lisp 1.1)
.gc3	Lisp language source code file (Golden Common Lisp 3.1)
.gcd	Generic CAD Drawing format (vector)
.gdf	Dictionary file (GEOS)
.gds	McDonnell-Douglas Things
.ge	Config file (GEcho)
.ged	Compiled config file (GoldED for DOS)
.ged	Graphics (Graphic Environment Document) (Arts & Letters)
.ged	Graphics editor file (EnerGraphics)
.gef	Graphics Exchange Format
.gem	Vector graphics (Digital Research GEM metafile) (Ventura Publisher)
.gen	Compiled template (dBASE Application Generator)
.gen	Generated text file (Ventura Publisher)
.geo	Compiled config file (GoldED for OS/2)
.geo	Geode (GEOS executable) (Geoworks)
.gex	Config file (GEcho)
.gfb	Compressed GIF image (GIFBlast)
.gfi	Genigraphics Graphics Link presentation
.gfo	SGI Radiosity
.gft	Font file (GEM - NeoPaint)
.gfx	Genigraphics Graphics Link presentation
.gfx	Graphics Files (Instant Artist)
.gib	Chart (Graph-in-the-Box)
.gid	General index (Windows 95 help)
.gif	Bitmap graphics (GIF87A/GIF89A CompuServe Graphics Interchange Format)
.giff	Bitmap graphics (GIF87A/GIF89A CompuServe Graphics Interchange Format)
.gim	Genigraphics Graphics Link presentation
.gis	Bitmap graphics (Erdas gray-scale image)
.giw	Presentation (Graph-in-the-Box for Windows)
.gix	Genigraphics Graphics Link presentation
.gkh	Disk Image (VFX SD EPS ASR TS) (Ensoniq)
.gks	Graphics Kernel System
.gl	Animation (GRASP - GRAphical System for Presentation format)
.gl	Script (GALink)
.glb	Global module in Basic programs
.glm	Datafile (Glim)
.glo	Global module in Basic programs
.gls	Datafile (Across)
.gly	Glossary (MS Word)
.gm	Bitmap graphics (Autologic files)
.gm2	Bitmap graphics (mode 2 black/white) (Autologic files)
.gm4	Bitmap graphics (mode 4 gray-scale) (Autologic files)
.gmf	CGM graphics (APPLAUSE)
.gmp	Geomorph tile map (SPX)
.gna	Genigraphics Graphics Link presentation
.gnt	Generated code (Micro Focus COBOL/2)
.gnx	Genigraphics Graphics Link presentation
.go	Bitmap graphics (GraphOn graphics file)
.gobj	Object code (non-error-checking version) (Geoworks)
.goc	GOC language source code file (Geoworks)
.goe	Satellite image data (GOES file) (McIDAS system)
.goes	Satellite image data (GOES file) (McIDAS system)
.goh	Goc language header file (Geoworks)
.gould	Bitmap graphics (Gould scanner file)
.gp	Geode parameter file (Geoworks)
.gp	Gofer project (Haskell language dialect)
.gp4	GTX Group IV format
.gph	Graph (Lotus 1-2-3/G)
.gpk	Compressed Omnigo file archive (Geos package)
.gq	Epson's page description language (printer)
.gr2	Screen driver (Windows 3.x)
.gra	Chart (MS Graph 97)
.gra	Datafile (SigmaPlot)
.gra	Graph (Microsoft Graph)
.grads	Metafile
.grasp	Animation (GRAphical System for Presentation format)
.gray	Bitmap graphics (raw gray bytes)
.grb	Bitmap graphics B&W binary (GROB Graphic Object) (HP-48sx calculator)
.grb	Ms-DOS Shell Monitor file (MS-DOS 5)
.grd	Drivers for GRX (graphics library)
.grdef	UI resource file (Geoworks)
.grf	Graph file (Graph Plus - Charisma)
.grib	Gridded Binary (FM 92-VIII Ext. GRIdded Binary file) (WMO CBS)
.grn	Drivers for GRX (graphics library)
.grp	Group file (Windows 3.x - Papyrus)
.grp	Pictures group (PixBase)
.gry	Graphics (Raw GREY)
.gs	Gofer script (Haskell language dialect)
.gs1	Presentation (GraphShow)
.gsd	GSM internet realtime audio
.gsd	Vector graphics (Professional Draw)
.gsm	Sound (GSM 6.10 prI-ETS 300 036 13kbit/s) (Internet phones)
.gsp	Sketch (Geometer's Sketchpad)
.gss	Script (Geometer's Sketchpad)
.gsw	Worksheet (GraphShow)
.gtar	Compressed file archive (GNU tar)
.gtx	Raster graphics (GTX Group IV)
.gup	Data (PopMail)
.gv	GrandView outline file
.gwx	Genigraphics Graphics Link presentation
.gwz	Genigraphics Graphics Link presentation
.gxl	Graphics library (Genus)
.gym	Generic symbol file (Geoworks)
.gz	Compressed file archive (GNU Zip)
.gzip	Compressed file archive (GNU Zip)

[ h ]

.h	Header file
.h!	Help database (Flambeaux Help - Perfect Database)
.h++	Header file (C++)
.h--	Header file (Sphinx C--)
.ha	Compressed file archive (HA)
.hal	Data file (Hyper Access Lite OS/2)
.ham	Disk Drivers NPA (Novell NetWare)
.hap	Compressed file archive (HAP)
.hbk	Handbook (Mathcad)
.hc	Header file
.hcom	Sound (Macintosh)
.hdf	Bitmap graphics (Hierarchical Data File) (NCSA)
.hdf	Help file (Help Development Kit)
.hdl	Alternate download file listing (Procomm Plus)
.hdr	Database header (Pc-File+)
.hdr	Datafile (Egret)
.hdr	Message header (Procomm Plus - 1st Reader)
.hds	Hierarchical Data System
.hdw	Vector graphics (Harvard Draw)
.hdx	Help index (AutoCAD - Zortech C++)
.hed	Document (HighEdit)
.hel	Game data (Microsoft Hellbender)
.hep	Novell Help Librarian Data File (Novell NetWare)
.hex	Encoded file archive (ascii) (Macintosh BinHex)
.hex	Hex dump
.hfi	Hp Font Info file (GEM)
.hgl	Highlight groups definitions (DN)
.hgl	Vector graphics (HP Graphics Language)
.hh	C++ header file
.hhh	Precompiled header file (Power C)
.hhp	Help information for remote users (Procomm Plus)
.hi	High scores (games)
.hig	High scores (games)
.hin	Molecule (HyperChem)
.hips	Bitmap graphics (HIPS file)
.his	History of executing/viewing/editing (DN)
.hlb	Help library (VMS)
.hlp	Program online help information
.hlx	Help file (MultiEdit)
.hlz	Packed help file (MultiEdit)
.hmi	Music (MIDI)
.hmm	Alternate Mail Read option menu (Procomm Plus)
.hmp	Music (MIDI)
.hnc	CNC program files Heidenhain (?) dialog
.hof	Game data (best scores)
.hp	Primary hash file (THOR database)
.hp	Printout file for HP printers/plotters (HP/GL)
.hp8	Text in HP Roman8 character set (NewWave Write)
.hpf	HP LaserJet fonts (PageMaker)
.hpg	Vector graphics (HPGL plotter file) (AutoCad - Harvard Graphics)
.hpgl	Vector graphics (plotter file) (Hewlett-Packard Graphics Language)
.hpi	Font information (GEM)
.hpj	Help project (MS Help Compiler)
.hpk	Compressed file archive (HPack)
.hpl	Vector graphics (Hewlett-Packerd LasetJet)
.hplj	Vector graphics (Hewlett-Packerd LasetJet)
.hpm	Alternate Main menu for privileged users (Procomm Plus)
.hpm	Emm text (HP NewWave)
.hpm	High Performance Map (Quaestor 1.x)
.hpp	C++ header (Zortech C++ - Watcom C/C++)
.hpp	Vector graphics (Hewlett-Packard Printer Control Language)
.hppcl	Vector graphics (Hewlett-Packard Printer Control Language)
.hqx	Encoded Macintosh archive (ascii) (BinHex)
.hrf	Bitmap graphics (Hitachi Raster Format) (CADCore)
.hrh	Common header for resources and C++
.hrm	Alternate Main menu for limited/normal users (Procomm Plus)
.hrz	Graphics (SSTV)
.hs	Literate Haskell source code file
.hs2	Monochrome image (Postering)
.hsc	2-op FM music file (HSC tracker)
.hsi	Bitmap graphics (Handmade Software Inc) (Image Alchemy)
.hsp	WWW page project (HomeSite)
.hst	Graphics histogram (HSI raw file) (Handmade Software)
.hst	History
.ht	Data (HyperTerminal)
.htm	HyperText Markup Language document (WWW)
.html	HyperText Markup Language document (WWW)
.htmls	HyperText Markup Language document with server-side include (WWW)
.htt	HyperText Template
.htx	HTML template (MS FrontPage)
.hwd	Presentation (Hollywood)
.hx	Cross-reference hash file (THOR database)
.hxm	Alternate Protocol Selection menu for all users (Procomm Plus)
.hxx	C++ header
.hy1	Hyphenation algorithms (Ventura Publisher)
.hy2	Hyphenation algorithms (Ventura Publisher)
.hyc	Data (WordPerfect)
.hyd	Hyphenation dictionary (WordPerfect for Win)
.hyp	Compressed file archive (Hyper)
.hz	Chinese text

[ i ]

.i	Analysis data (Phase Vocorder)
.i	Preprocessor output file (Borland C Preprocessor)
.i3	Interface (Modula 3)
.iax	Bitmap graphics (IBM Image Access eXecutive file)
.ibg	Planetary images by NASA (PDS format)
.ibm	Compressed file archive (Internal IBM only) (ARCHDOS)
.ic1	Bitmap graphics (Atari Image)
.ic2	Bitmap graphics (Atari Image)
.ic3	Bitmap graphics (Atari Image)
.ica	Bitmap graphics (Image Object Content Architecture)
.ica	Citrix file
.icb	Bitmap graphics (Targa bitmap)
.icc	Bitmap graphics (Kodak ICC printer file)
.ice	Archive (Cracked LHA) (old Lha)
.icm	ICC configuration
.icn	Graphics (RIP icon)
.icn	Icon language source code file
.ico	Icon image (Windows 3.x)
.icon	Icon image (1bit) (Sun icon file) (Unix)
.icp	Parameter file (IContact) (Unix)
.icr	Bitmap graphics (NCSA Telnet Interactive Color Raster graphic file)
.id	Disk identification file
.idb	Database (IDA)
.idc	Bitmap graphics (Core Software Tech CORE IDC file)
.idc	Document (Internet Database Connector)
.idc	IDA C language source code file (IDA)
.idd	MIDI Instrument Definition
.ide	Project (Borland C++ 4.x)
.idf	MIDI instrument definition
.idl	Interface definition file (Visual C++)
.ids	Imported names format (IDA)
.idw	Vector graphics (IntelliDraw)
.idx	Header information (CMYK image) (Stork format)
.idx	Index (many - FoxPro)
.ief	Bitmap graphics (Image Exchange Format)
.ifd	Form (JetForm Design)
.iff	Bitmap graphics (Sun TAAC Image File Format)
.iff	Bitmap graphics or sound (Amiga IFF/8SVX Interchange File Format)
.ifp	Script (KnowledgeMan)
.ifs	Fractal image compressed file (YuvPak)
.ifs	Installable file system (OS/2)
.ifs	Iterated function system fractal (Fractint)
.iges	2D or 3D CAD model (Initial Graphics Exchange Specification format)
.igf	Inset Systems metafile
.igs	2D or 3D CAD model (Initial Graphics Exchange Specification format)
.ihp	Help file (Watcom)
.ihs	Inbound History (Bink/+)
.ii	Preprocessed C++ source code (gcc)
.iif	Interchange file (QuickBooks for Windows)
.il	Inline expansion file (Fortran 90)
.il	hDC Designer Icon Lin Dll format
.ilb	Data (Scream Tracker)
.ilbm	Bitmap graphics (Amiga Interleaved Bitmap format)
.ilk	Outline of program's format (incremental linker) (MS ILink)
.im	Bitmap graphics (Sun raster file)
.im1	Bitmap graphics (1bit) (Sun raster file)
.im24	Bitmap graphics (24bit) (Sun raster file)
.im32	Bitmap graphics (32bit) (Sun raster file)
.im8	Bitmap graphics (8bit) (Sun raster file)
.ima	Graphics (WinImage)
.ima	Mirage vector graphics (EGO - Chart - Autumn)
.image	Disk Image (Disk Copy, ShrinkWrap)
.img	Bitmap graphics (GEM or ADEX format) (Ventura Publisher)
.img	Disk Image (Disk Copy, ShrinkWrap)
.imp	Spreadsheet (Lotus Improv)
.imq	Image presentation (ImageQ)
.imq	Planetary images by NASA (PDS format)
.in	Input
.in$	Installation file (HP NewWave)
.in3	Input device driver (Harvard Graphics 3.0)
.inb	Test script (Vermont HighTest)
.inc	Include file (several programming languages)
.ind	Data Index (dBASE IV)
.inf	Hypertext help system file (OS/2)
.inf	Information (ascii file)
.inf	Setup information
.info	GNU info reader (output from texinfo) (unix)
.info	Icon Data (Amiga)
.ingr	Intergraph Raster File Format
.ini	Initialization file
.ink	Pantone reference fills file (CorelDraw)
.inl	C++ inline function implementation
.inn	Overlay (Micro Focus COBOL/2)
.ins	Datafile (WordPerfect)
.ins	Installation script (1st Reader)
.ins	Instrument File (Adlib - Ensoniq)
.ins	Internet communications settings (MS IIS)
.int	Interface module source (Borland)
.int	Intermediate code (semi-compiled) (Signature - Micro Focus COBOL/2)
.inx	Index (Foxbase)
.io	Compressed file archive (CPIO)
.iob	3d graphics database in TDDD format
.ioc	Organizational chart (Instant ORGcharting!)
.ion	Descript.ion file (file descriptions) (4DOS)
.ip	Data (Interactive Physics)
.ip	Inspection Procedures (NRC Inspection Manual)
.ipl	Pantone Spot reference palette file (CorelDraw)
.ips	IPScript (IPIX)
.ipx	IPIX file (IPIX)
.iqy	Web query file (MS Excel)
.irc	Sound (IRCAM format)
.iris	Bitmap graphics (Silicon Graphics RGB image file)
.irs	Resource (WordPerfect)
.irtp	Graphics (Graphicon-2000 Interactive Real-Time PHIGS)
.isd	Spelling Checker dictionary (RapidFile)
.ish	Compressed file archive (ISH)
.iso	ISO-9660 table
.isp	Internet service provider settings (MS IIS)
.it	Music (Impulse Tracker)
.it	Settings (intalk)
.itf	Interface file (JPI TopSpeed Pascal)
.its	Internet Document Set
.iv	3D object (Open Inventor format)
.iv-vrml	Inventor VRML Format document
.ivb	Bitmap graphics (Truevision Targa format)
.ivr	Virtual reality world (live picture)
.ivt	Information title (InfoViewer)
.iw	Presentation flowchart (IconAuthor - HSC InterActive)
.iw	Screensaver (Idlewild)
.iwa	Text document (IBM Writing Assistant)
.iwp	Text document (Wang)
.izt	Binary token file (IZL)

[ j ]

.jam	Jam messagebase (FTN software)
.jam	Music (JamTracker module)
.jar	Compressed file archive (JAR)
.jas	Graphics (JAS Compressed)
.jasc	Graphics (JAS Compressed)
.jav	Java language source code file
.java	Java language source code file
.jbd	Datafile (SigmaScan)
.jbig	Joint Bilevel Image Group
.jbx	Project file (Project Scheduler 4)
.jcm	Java commerce message
.jet	Fax (Hybrid JetFax)
.jff	Bitmap graphics (JPEG File Interchange Format)
.jfif	Bitmap graphics (JPEG File Interchange Format)
.jif	Bitmap graphics (JPEG File Interchange Format)
.jis	Japanese text
.jms	Music format (JMusic file) (UltraForce)
.jn1	Game data (Epic MegaGames Jill of the Jungle)
.job	Job object (Scheduler)
.joi	Join conferences file (XBoard)
.jor	Journal file SQL
.jou	Journal file (VAX Edt editor)
.jpc	Bitmap graphics (Japan PIC)
.jpe	Bitmap graphics (JPEG Joint Photography Experts Group format)
.jpeg	Bitmap graphics (JPEG Joint Photography Experts Group format)
.jpg	Bitmap graphics (JPEG Joint Photography Experts Group format)
.js	JavaScript language source code file (script)
.jsm	Jigsaw file (JugWin)
.jss	Jigsaw file (JugWin)
.jtf	Bitmap graphics (JPEG Tagged Interchange Format)
.jtf	Fax (Hayes JT Fax)
.jut	Jutvision Scene (Jutvision)
.jw	Text document (JustWrite)
.jwl	Library (JustWrite)
.jzz	Spreadsheet (Jazz)

[ k ]

.k3d	Description of macro language (3DS)
.kar	Karaoke (MIDI music with word track)
.kar	Precompiled .prg for KARAT (Rus. FOX+ 2.0)
.kb	Keyboard script (Borland C++ 4.5)
.kb	Program source (Knowledge Pro)
.kbd	Keyboard mapping (LocoScript - Signature - Procomm Plus)
.kbm	Keyboard mapping (Reflection 4.0)
.kcl	Lisp language source code file (Kyoto Common Lisp)
.kdc	Bitmap graphics (Kodak Digital Camera) (PhotoEnhancer)
.kex	Macro (KEDIT)
.key	Archive .key-file (OS/2)
.key	Datafile (Forecast Pro)
.key	Keyboard macros
.key	Security file eg. Registration info
.kfx	Graphics (Group 4 image) (KoFax)
.kit	Power Chords drum kit file (Power Chord)
.kml	Kedit Macro Library
.knn	Database key file (Clarion)
.kpp	Toolpad (SmartPad)
.kps	Ibm KIPS bitmap graphics
.kqp	Bitmap graphics (Konica Quality Photos)
.krz	Kurzweil K2000 File (Kurzweil)
.kyb	Keyboard mapping (FTP Software PC/TCP)
.kye	Game data (Kye)

[ l ]

.l	L-System fractal (Fractint)
.l	Lex language source code file
.l	Linker directive file (WATCOM wlink)
.l	Lisp language source code file
.la	Netscape packetized audio (LiveAudio)
.lab	Datafile (NCSS - SOLO)
.lab	Mailing labels (Q+E for MS Excel)
.lam	Streaming audio metafile (Netscape Media Player)
.lan	Bitmap graphics (Erdas true colour image)
.lan	LAN Drivers (Novell NetWare)
.landsat	Bitmap graphics (EOSAT's Landsat Thematic Mapper data file)
.latex	Text document (LaTeX)
.lay	Word chart layout (APPLAUSE)
.lbg	Label generator data (dBASE IV)
.lbl	Label (dBASE IV - Clipper 5 - dBFast)
.lbm	Bitmap graphics (Amiga Interleaved Bitmap format) (Deluxe Paint)
.lbm	Linear bitmap graphics (XLib)
.lbo	Compiled label (dBASE IV)
.lbr	Compressed file archive (LU)
.lbr	Display driver (Lotus 1-2-3)
.lbt	Additional (FPT) label description file (FoxPro)
.lbx	Main (DBF) label description file (FoxPro)
.lcf	Linker Control File (Norton Guides compiler)
.lch	Chart (IBM Works for OS/2)
.lck	Lock file (especially for database access control)
.lcl	Data (FTP Software PC/TCP)
.lcn	Lection (WordPerfect)
.lcs	Datafile (ACT! History Files)
.lcw	Spreadsheet (Lucid 3-D)
.ld	Long Distance codes file (Telix)
.ld1	Overlay file (dBASE)
.ldb	Data filer database (IBM Works for OS/2)
.ldb	Record-locking information (MS Access)
.ldf	Data filer form (IBM Works for OS/2)
.ldf	Library definition file (Geoworks)
.le	Executable image (DOS/4GW PM 32X DOS Extender)
.leg	Document (Legacy)
.les	Lesson (check *.cbt)
.lev	Level file (eg. NetHack 3.x)
.lex	Lexicon (dictionary) (many)
.lfd	LucasArts resource file (LucasArts games)
.lft	Laser printer font (ChiWriter)
.lg	Logo procedure definitions (LSRHS Logo)
.lgo	Logo for header and footer (SuperFax)
.lgo	Startup logo code (Windows 3.x)
.lha	Compressed file archive (LHA - LHARC)
.lhs	Literate Haskell source code file
.lhw	Compressed Amiga file archive (LHWarp)
.lhz	Compressed file archive (LHA)
.lib	Library file (several programming languages)
.lic	License file
.lif	Compressed file archive (CA Clipper installer)
.lif	Logical Interchange Format data file (Hewlett-Packard)
.lim	Compressed file archive (Limit)
.lin	Line types (AutoCAD)
.lin	Vector data (ARC format)
.lis	Listing (VAX)
.lispm	Bitmap graphics (Lisp Machine file)
.lj	Bitmap graphics (HP LaserJet graphics file)
.lku	T9000 linkable unit
.ll3	Laplink III related file (document) (LapLink III)
.lma	Netscape packetized audio (LiveAudio)
.lmp	Demo for Doom (3D computer game) (Doom - Doom2)
.ln03	Bitmap graphics (DEC LN03+ Sixel file)
.lng	Language definition file
.lng	Language extensions (Lahey Fortran)
.lnk	Link (shortcut) (Windows 95)
.lnk	Linker script (.RTLink)
.loc	Localisation string resource header file
.lod	Load file
.log	Log file
.lpc	Printer driver (TEKO)
.lpc	Sound (Linear Predictive Coding)
.lpd	Nuts and Bolts file (Helix)
.lrc	Intel Video Phone file
.lrf	Linker response file (MS C/C++)
.lrp	Report (IBM Works for OS/2)
.lrs	Language Resource File (WordPerfect for Win)
.lrt	Log file (Yacc)
.lsa	Ascii data (LightScape Technologies)
.lsb	Binary data (LightScape Technologies)
.lsp	Lisp language source code file (AutoLISP - Xlisp)
.lss	Spreadsheet (Legato - IBM Works for OS/2)
.lst	Keyboard macro (1st Reader)
.lst	List file (archive index - compiler listfile)
.lst	Listing (e.g. source code)
.lst	Spool file (Oracle)
.ltm	Bitmap graphics (EOSAT's Landsat Thematic Mapper data file)
.ltm	Form (Lotus Forms)
.ltx	Mathematical text document (LaTeX)
.lwd	Text document (LotusWorks)
.lwob	Lightwave Object Format
.lwp	Document (Lotus Word Pro)
.lwp	Word processor (IBM Works for OS/2)
.lyr	Song lyrics (ascii)
.lzd	Difference file for binaries (Ldiff 1.20)
.lzh	Compressed file archive (LHA - LHARC)
.lzs	Compressed file archive (LARC)
.lzw	Compressed Amiga file archive (LHWarp)

[ m ]

.m	Common binary file name extension (Maple)
.m	Function and commands (Matlab M-file - Mathematica)
.m	Macro module (Brief)
.m	Objective-C language source code file (gcc)
.m	Script file (Miranda programming language)
.m	Standard package (Mathematica)
.m11	Sound (Farallon's MacRecorder format) (sampling rate 11k)
.m11	Text file (MASS11)
.m1a	MPEG-1 audiostream
.m1s	MPEG-1 systemstream
.m1v	MPEG-1 IPB videostream
.m2	Modula 2 language source code file
.m22	Sound (Farallon's MacRecorder format) (sampling rate 22k)
.m2a	Sound (MPEG-2 audio)
.m2v	Video (MPEG-2 IPB videostream)
.m3	Modula3 language source code file
.m3a	Sound (MPEG-3 audio)
.m3d	3d animation macro (Corel Motion)
.m4	M4 preprocessor file (unix)
.m7	Sound (Farallon's MacRecorder format) (sampling rate 7k)
.m_u	Backup of boot sector FAT and boot dir (MazeGold)
.ma	Ascii file (notebook) (Mathematica)
.ma	hDC products for MicroApp executable files (MicroApp)
.ma3	Macro (Harvard Graphics 3.0)
.mac	Bitmap graphics B&W (Apple Macintosh MacPaint file)
.mac	Macro
.macp	Bitmap graphics B&W (Apple Macintosh MacPaint file)
.mad	Module shortcut (MS Access)
.maf	Form shortcut (MS Access)
.mag	Woody Lynn's MAG graphics format (MPS Magro Paint System)
.mah	Settings (Mahjongg Solitaire)
.mai	Mail message (VAX)
.mak	Project makefile
.mam	Macro shortcut (MS Access)
.man	Formatted manual page
.map	Color palette (colormap intensities and indices)
.map	Format data (Micrografx Picture Publisher)
.map	Geographical map (Atlas MapMaker)
.map	Linker map file
.map	Network map (AccView)
.maq	Query shortcut (MS Access)
.mar	Assembly program (VAX Macro)
.mar	Report shortcut (MS Access)
.marm	Makefile for MARM (EPOC32)
.mas	Smartmaster set (Freelance Graphics)
.mat	Matrix data file (Matlab)
.mat	Table shortcut (MS Access)
.max	Max language source code file
.maz	Game data (Hover maze)
.mb	Binary file (bitmaps etc.) (Mathematica)
.mb	Memo field values for database (Paradox)
.mb1	Game data (Apogee Monster Bash)
.mbfavs	Bitmap graphics (24bit) (AVS X image file)
.mbfavs	Bitmap graphics (AVS X image file)
.mbfx	Bitmap graphics (24bit) (AVS X image file)
.mbfx	Bitmap graphics (AVS X image file)
.mbk	Multiple index file backup (dBASE IV)
.mbm	Multi-bitmap file (EPOC32)
.mbx	Mailbox (Eudora/Zerberus)
.mc	Manual Chapter (NRC Inspection Manual)
.mc$	Magic Xchange package (Magic Cap file archive)
.mcc	Configuration file (Mathcad)
.mcc	Dialer10 calling card
.mcc	Shortcut to MSN (Windows 95)
.mcd	Document (Mathcad)
.mcf	Font file (Mathcad)
.mcf	Graphics (Hotsauce)
.mci	Command script (Media Control Interface)
.mcl	Macro library (MultiEdit)
.mcp	Application script (Capsule)
.mcp	Composed Media multimedia file (NetMC Player)
.mcp	Printer driver (Mathcad)
.mcs	Image (MathCAD)
.mcw	Text document (MacWrite II - MS Word for Macintosh)
.md	Compressed file archive (MDCD)
.mda	Add-in (MS Access)
.mdb	Database (MS Access)
.mde	MDE database (MS Access)
.mdl	Model (3D Design Plus)
.mdl	Spreadsheet (CA-Compete!)
.mdm	Modem definition (TELIX)
.mdn	Blank database template (MS Access)
.mdp	Project workspace (MS Developer Studio)
.mdr	Microdrive file (ZX Spectrum emulator)
.mdt	Add-in data (MS Access)
.mdt	Data table (MS ILink incremental linker)
.mdw	Workgroup information (MS Access)
.mdx	Multiple index file (dBASE IV)
.mdz	Database wizard (MS Access)
.mdz	Description of music module (Cubic Player - Cross-View)
.me	Ascii text (READ.ME)
.me	Configuration (MultiEdit)
.me	Formatted manual page with me macros
.meb	Macro Editor bottom overflow file (WordPerfect Library)
.mec	MECCA source (Maximus)
.med	Macro Editor delete save (WordPerfect Library)
.med	Music format (Amiga MED/OctaMED)
.mem	Macro Editor macro (WordPerfect Library)
.mem	Memory variable save file (Clipper - dBASE IV - FoxPro)
.mem	Memos datafile (Clarion)
.meq	Macro Editor print queue file (WordPerfect Library)
.mer	Macro Editor resident area (WordPerfect Library)
.mes	Macro Editor work space file (WordPerfect Library)
.mes	Message
.met	Document (Omnipage Pro)
.met	Graphics metafile (OS/2)
.met	Macro Editor top overflow file (WordPerfect Library)
.met	Metafile (OS/2)
.meu	Menu group (DOS Shell)
.mex	Dynamically linked subroutines (Macintosh) (Matlab)
.mex	Macro Editor expound file (WordPerfect Library)
.mex4	Dynamically linked subroutines (Sun-4/SPARC) (Matlab)
.mexds	Dynamically linked subroutines (DECStation) (Matlab)
.mexhp3	Dynamically linked subroutines (HP9000/series 300) (Matlab)
.mexhp7	Dynamically linked subroutines (HP9000/series 700) (Matlab)
.mexn	Dynamically linked subroutines (NeXT) (Matlab)
.mexrs6	Dynamically linked subroutines (IBM RS/6000) (Matlab)
.mexsg	Dynamically linked subroutines (SGI) (Matlab)
.mf	Metafont text file (TeX)
.mfd	Monadic functions (ABC programming language)
.mfm	Music format (DMP)
.mgf	Font (Micrografx)
.mgf	Materials and Geometry Format
.mgr	Bitmap graphics (MGR bitmap file)
.mgx	Drawing (Designer 4.1)
.mht	Message HTML document
.mhtml	Message HTML document
.mi	Miscellaneous
.mib	SNMP MIB file
.mic	Data (Microsoft Image Composer)
.mid	Music (Musical Instrument Digital Interface)
.midi	Music (Musical Instrument Digital Interface)
.mif	Data (FrameMaker)
.miff	Bitmap graphics (Magick Image File Format)
.mii	Datafile (MicroStat-II)
.mil	Raster graphics (CALS Group IV Type 2)
.mime	Message in MIME format (RFC822)
.mis	Mission file (many games)
.mitsu	Bitmap graphics (Mitsubishi S340-10 color sublimation printer file)
.mix	Object file (Power C)
.mk	Makefile
.mke	Makefile (MS Windows SDK)
.mkg	Makefile
.mki	Japanese graphics MAKIchan format (MagView 0.5)
.mks	Data (TACT)
.ml	ML language source code file
.ml3	Project (Milestones 3.x)
.mlb	Macro library file (Symphony)
.mli	Materials libraries (3D Studio)
.mm	Text document (MultiMate Advantage II)
.mm	Virtual reality world (Meme)
.mmf	Mail message file (MS Mail)
.mmm	Multimedia movie format (RIFF RMMP) (MacroMind Director 3.x)
.mmo	Memo writer file (RapidFile)
.mmp	Output video format from Bravado board
.mmp	makmake makefile project (EPOC32)
.mnd	Menu source (AutoCAD Menu Compiler)
.mng	Bitmap graphics (Multiple-image Network Graphics)
.mng	Map (DeLorme Map'n'Go)
.mnt	Additional (FPT) menu description file (FoxPro)
.mnu	Advanced macro (HP NewWave)
.mnu	Menu (AutoCAD Menu Compiler - Norton Commander - Signature)
.mnx	Compiled menu (AutoCAD)
.mnx	Main (DBF) menu description file (FoxPro)
.mny	Account book (MS Money)
.mob	Device definition (PEN Windows)
.mod	Kernel module (Windows 3.x)
.mod	Modula-2 language source code file (Clarion Modula-2)
.mod	Music (Amiga MODule format) (DMP - FastTracker - MDP - ST)
.mod	Spreadsheet (Microsoft Multiplan)
.mol	MDL Molfile
.mon	Monitor description (ReadMail)
.moo	MoonRock language source code file (MoonRock)
.mov	Movie (AutoCAD AutoFlix)
.mov	Timebased multimedia file (Apple QuickTime)
.moz	Temporary cache file (Netscape)
.mp	Movie (MPEG compressed)
.mp2	Sound (MPEG-1 Layer II Audio Stream)
.mp3	Sound (MPEG-1 Layer III Audio Stream)
.mpa	Sound (MPEG-1 audio stream)
.mpc	Calender file (MS Project)
.mpd	Monadic predicates (ABC programming language)
.mpe	Movie (Moving Pictures Expert Group format)
.mpeg	Movie (Moving Pictures Expert Group format)
.mpg	Movie (Moving Pictures Expert Group format)
.mpm	Mathplan macro (WordPerfect Library)
.mpnt	Bitmap graphics (Apple Macintosh MacPaint file)
.mpp	Project file (MS Project)
.mpr	Generated executable menu file (FoxPro)
.mpt	Bitmap graphics (Multipage TIFF)
.mpv	View file (MS Project)
.mpx	Compiled executable menu file (FoxPro)
.mrb	Multiple Resolution Bitmap graphics (MS C/C++)
.mrc	Bibliographic data (Machine-Readable Cataloging records)
.mrk	CSI markup file (CAD format)
.mrk	Windows User Benchmark (Windows 95)
.mrs	Macro Resource file (WordPerfect for Win)
.ms	Formatted manual page with ms macros
.ms	Microsoft antivirus report (MSAV)
.ms	Worksheet (Maple)
.msc	Microsoft C makefile
.msdl	Manchester Scene Description Language
.msg	Digitized voice file (ZVoice)
.msg	Message(s)
.msn	Microsoft Network document
.msp	Bitmap graphics (Microsoft Paint format)
.mss	Manuscript text file (Perfect Writer - Scribble - MINCE - Jove)
.mst	Document (MS Test)
.mst	Minispecification file (Prosa)
.mst	Setup script (MS Windows SDK)
.msw	Text document (MS Word)
.msx	Compressed CP/M file archive (MSX)
.mth	Math file (Derive)
.mtl	Wavefront
.mtm	Music (MultiTracker Module)
.mtv	Bitmap graphics (24bit) (MTV RayTracer)
.mtw	Data file (Minitab)
.mu	Menu (Quattro Pro)
.mus	Sound file (MusicTime - Doom)
.mvb	Data (Microsoft Multimedia Viewer)
.mvf	Stop frame file (AutoCAD AutoFlix)
.mvi	Movie command file (AutoCAD AutoFlix)
.mvw	Log file (Saber LAN)
.mw	Text document (MacWrite II)
.mwf	Animation (ProMotion)
.mwii	Text document (MacWrite II)
.mwp	SmartMaster (Lotus Word Pro)
.mx	Common matrix routines (Matlab)
.mx3	Dynamically linked subroutines (80386/486 MS-Windows) (Matlab)
.mxl	Support file (PackRat 5.0)
.mxt	Data (MS C)
.myp	Presentation (MM Make Your Point)

[ n ]

.nam	Name Space Modules (Novell NetWare)
.nap	Vector graphics (Naplps format) (VideoShow - EnerGraphics)
.naplps	Vector graphics (North American Presentation Layer Protocol Syntax)
.nb	Text document (Nota Bene)
.nc	Graphics (Unidata netCDF)
.nc	Instructions for NC (Numerical Control) machine (CAMS)
.nc	Preprosessed GOC source code file (non-error-checking version) (GEOS)
.ncb	Class browsing information (MS Developer Studio)
.ncc	CNC (Computer Numeric Control) control file (CamView 3D)
.ncd	Norton Change Directory support file (Norton Commander)
.ncm	Configuration message (Nokia Communicator)
.ncs	Netscape Conference Call file (Netscape)
.ncsa	Bitmap graphics (Hierarchical Data File) (NCSA)
.ndb	Network database (Intellicom - Compex)
.ndl	Data (Lotus Notes)
.ndl	Inmos hardware network description file
.ndl	Nodelist file
.ndx	Index file (dBASE II - III - IV - dBFast)
.neo	Bitmap graphics (Atari NeoChrome image file)
.net	Network configuration/info file
.netcdf	Scientific data Network Common Data Format
.new	New info
.news	Bitmap graphics (NeWS image file)
.nff	Haines Neutral File Format
.nff	Neutral File Format (WorldToolKit)
.nfo	Filioview database
.nfo	Help format (Netware Folio)
.nfo	Info file
.ng	Online documentation database (Norton Guide)
.ngo	NG linker object file (NGML)
.ngs	NG compiler source file (NGC)
.nif	Binary hardware network initialisation file
.nif	Bitmap graphics (Navy Interchange File Format)
.niff	Bitmap graphics (Navy Interchange File Format)
.nitf	National Imagery Transmission Format
.nl	Norton Desktop Icon Library
.nlm	Netware loadable module (Novell Netware)
.nlx	Form (FormWorx 3.0)
.not	Notation
.note	Help document (WordPerfect for Mac)
.now	Usually README file
.np	Project schedule (Nokia Planner) (Visual Planner 3.x)
.npi	Source for DGEN.EXE interpreter (dBASE Application Generator)
.nrf	Bitmap graphics (Neutral Raster File)
.ns2	Data (Lotus Notes)
.ns3	Data (Lotus Notes)
.nsf	Data (Lotus Notes)
.nsg	Data (Lotus Notes)
.nsh	Data (Lotus Notes)
.nss	Norton screensaver module (NC - NDW Screen Saver)
.nst	Music module (NoiseTracker)
.nsx	Compound index file (SuccessWare SIX 3.00)
.nt	Startup files (Windows NT)
.ntf	Data (Lotus Notes)
.ntr	Executable ascii text file (strip header and rename) (NetRun)
.nts	Executable ascii text file (strip header and rename) (NetSend)
.nts	Tutorial (Norton)
.ntx	Database index (Clipper 5)
.nuf	Message for new users on their 1st call (Procomm Plus)
.nws	Info text file (latest news) (ascii)
.nxt	Sound (NeXT format)

[ o ]

.o	Object file (Unix - Atari - GCC)
.o$$	Outfile (Sprint)
.oaz	Fax (NetFax Manager)
.ob	Object cut/paste file (IBM LinkWay)
.obd	Binder (MS Binder)
.obj	Compiled machine language code (Intel Relocatable Object Module)
.obj	Object (Wavefront)
.obr	Object browser data file (Borland C++)
.obs	Script (ObjectScript)
.obt	Template (MS Binder)
.obv	Visual interface (ObjectScript)
.obz	Wizard (MS Binder)
.ocf	Object Craft File (Object Craft)
.ocr	Incoming fax transcribed to text (FAXGrapper)
.oct	Musical file (Octalizer)
.ocx	OLE custom control (Object Linking and Embedding)
.oda	ODA document
.oda	Raster graphics (CALS Group IV Type 2)
.odif	Open Document Interchange Format
.odl	Object Definition Language file (MS Developer Studio)
.ofd	Form definition (ObjectView)
.off	Vector graphics (Object File Format)
.ofm	PostScript font description file
.ofn	Document (MS Office)
.oft	Item template (MS Outlook)
.ohs	Outbound History (Bink/+)
.oid	Object interaction diagram (Prosa/OM)
.okt	Music format (8 channels) (Oktalyzer)
.olb	OLE object library
.olb	Object library (VAX)
.old	Backup file
.ole	OLE object
.oli	Text file (Olivetti)
.olk	Address book (MS Outlook)
.omd	Class model (Prosa/OM)
.omf	OMF Interchange file
.oom	Swap file (Shroom)
.opa	Object file (Psion OPL)
.opl	OPL language source code file (Psion)
.opn	Active options (Exact)
.opo	Object file (Psion OPL)
.opt	Optimize support file (QEMM)
.opt	Options
.opw	Organization chart (Org Plus for Windows)
.opx	Chart (MS Organization)
.opx	Inactive options (Exact)
.ora	Parameter file (Oracle)
.org	Calendar file (Lotus Organizer)
.org	Origin plot (Microcal Origin)
.oss	Search result (MS Office)
.otl	Outline font description (Z-Soft Type Foundry)
.otl	Ventura Publisher's Type Foundry Outline Editor format
.otx	Text file (Olivetti Olitext Plus)
.out	Output
.ov1	Overlay file (part of program to be loaded when needed)
.ov2	Overlay file (part of program to be loaded when needed)
.ovd	Datafile (ObjectVision)
.ovl	Overlay file (part of program to be loaded when needed)
.ovr	Overlay file (part of program to be loaded when needed)

[ p ]

.p	Database source code (Progress)
.p	Graphics (Applause picture file)
.p	Pascal language source code file
.p	Rea-C-Time application parameter file (ReaGeniX code generator)
.p10	Tektronix Plot 10 drawing
.p16	Music (16 channels) (ProTracker Studio 16)
.p22	Patch file (Patch22)
.p65	Document (PageMaker 6.5)
.pa1	Worktable (PageAhead)
.pab	Personal address book
.pac	Bitmap graphics (Atari STAD Image)
.pac	Package or song (SBStudio II)
.pad	Keypad definition (Telemate)
.paint	Bitmap graphics B&W (Apple Macintosh MacPaint file)
.pak	Compressed file archive (PAK)
.pal	Color palette
.pan	Printer-specific file (copy to coreldrw.ink) (CorelDraw)
.par	Parameter file (Fractint)
.par	Parts application (Digitalk PARTS)
.par	Permanent output file (Windows 3.x)
.pas	Pascal language source code file (Pascal - Delphi)
.pat	Bitmap graphics (1bit) (Patent data) (US Patent and Trademark Office)
.pat	Hatch patterns (AutoCAD - Photostyler)
.pat	Polygon Attribute Table (link geographic locations to databases)
.pat	Sound patch (Gravis Ultrasound)
.pat	Vector fill files (CorelDraw)
.pb	Fax (FAXability Plus)
.pb	Phonebook (WinFax Pro)
.pb	Proboard configuration files (Proboard)
.pb	Setup file (PixBase)
.pb1	Document (First Publisher for Windows)
.pba	Powerbasic BASIC language source code file (Genus)
.pbd	Phone book (FaxNOW! - Faxit)
.pbi	Powerbasic include file (Genus)
.pbi	Profiler Binary Input (MS Source Profiler)
.pbk	Phonebook
.pbl	Powerbasic library (Genus)
.pbm	Bitmap graphics (Poskanzer's Portable Bit Map format)
.pbm	Planar bitmap graphics (XLib)
.pbo	Profiler Binary Output (MS Source Profiler)
.pbt	Profiler Binary Table (MS Source Profiler)
.pc	Text file containing IBM PC specific info
.pc1	Bitmap graphics (Atari Degas Image)
.pc2	Bitmap graphics (Atari Degas Image)
.pc3	Bitmap graphics (Atari Degas Image)
.pc3	Custom palette (Harvard Graphics 3.0)
.pc8	Ascii text IBM8 character set (NewWave Write)
.pcb	P-CAD database (P-CAD)
.pcc	Cutout picture vector graphics (ZSoft PC Paintbrush)
.pcd	Bitmap graphics (multi-resolution) (Kodak Photo-CD)
.pcf	Profiler Command File (MS Source Profiler)
.pch	Patch file
.pch	Precompiled header (MS C/C++)
.pcj	Multimedia authoring tool graphics (IBM's Linkaway-Live)
.pck	Pickfile (Turbo Pascal)
.pcl	HP-PCL graphics data (HP Printer Control Language)
.pcp	Bitmap graphics (PCP file)
.pcs	Animated PICTs (Macintosh)
.pcs	Picture package (MS PowerPoint - MS ClipArt Gallery)
.pct	Bitmap graphics (Macintosh b&w PICT1 - color PICT2)
.pcw	Text document (PC Write)
.pcx	Bitmap graphics (ZSoft PC Paintbrush format)
.pda	Bitmap graphics
.pdb	Data (TACT - Packrat 5.0)
.pdf	Database Interchange Format (PCAD)
.pdf	Graphics file (ED-SCAN 24bit format)
.pdf	Portable Document Format (Adobe Acrobat)
.pdf	Print device information (Netware)
.pdg	Data (Print Shop Deluxe)
.pdl	Project Description Language file (Borland C++ 4.5)
.pds	Pldasm language source code file (hardware assembly)
.pds	Space mission data (Planetary Data System Format) (NASA)
.pdv	Printer driver (Paintbrush)
.pdw	Document (Professional Draw)
.pdx	Printer description (PageMaker)
.peb	Program Editor bottom overflow file (WordPerfect Library)
.ped	Program Editor delete save (WordPerfect Library)
.pem	Program Editor macro (WordPerfect Library)
.peq	Program Editor print queue file (WordPerfect Library)
.per	Program Editor resident area (WordPerfect Library) (vakioalue)
.pes	Program Editor work space file (WordPerfect Library)
.pet	Program Editor top overflow file (WordPerfect Library)
.pex	Proboard EXecutable program file (Proboard)
.pfa	Type 3 font file (unhinted PostScript font)
.pfb	Type 1 PostScript font (Adobe Type Manager)
.pfc	PF Component
.pfc	Text file (First Choice)
.pfk	Programmable function keys (XTreePro)
.pfm	Printer Font Metrics (Windows Type 1 font metric file)
.pfs	Database (PFS:FILE) - text file (PFS:Write)
.pft	Printer font (ChiWriter)
.pg	Page cut/paste file (IBM LinkWay)
.pgi	Printer Graphics File device driver (PGRAPH library)
.pgl	Vector graphics (HP Plotter)
.pgm	Bitmap graphics (PBM graymap)
.pgm	Program (Signature)
.pgp	Encrypted file (Pretty Good Privacy)
.pgs	Manual page (man4dos)
.ph	Optimized .goh include file (Geoworks)
.ph	Perl header file
.ph	Phrase-table (MS C/C++)
.phd	PolyHedra Database
.phm	Phone book (DN - Lync)
.phn	Phone list (UltraFax - QmodemPro)
.pho	Phone database (Metz Phone for Windows)
.phr	Phrases (LocoScript)
.pi1	Bitmap graphics (Atari Degas Image)
.pi2	Bitmap graphics (Atari Degas Image)
.pi3	Bitmap graphics (Atari Degas Image)
.pic	Bitmap graphics (Macintosh) (b&w PICT1 - color PICT2)
.pic	Bitmap graphics (PIXAR picture file)
.pic	Bitmap graphics (Pictor page format) (many)
.picio	Bitmap graphics (PIXAR picture file)
.pics	Animated PICT files (Macintosh)
.pict	Bitmap graphics (Apple Macintosh PICT file) (b&w PICT1 - color PICT2)
.pict2	Bitmap graphics (Apple Macintosh PICT file)
.pif	Graphics metafile (OS/2)
.pif	Program Information File (Windows 3.x)
.pif	Vector graphics GDF format (IBM mainframe computers)
.pim	Pascal text mode image file (Ultimate Draw)
.pin	Game data (Epic Pinball)
.pit	Compressed Macintosh file archive (PackIt)
.pix	Bitmap graphics (24bit RGB RLE) (Alias image file)
.pix	Bitmap graphics (Inset Systems format)
.pixar	Bitmap graphics (PIXAR picture file)
.pj	Bitmap graphics (HP PaintJet PCL graphics file)
.pj	Project (CA-SuperProject)
.pjt	Additional (FPT) project description file (FoxPro)
.pjx	Main (DBF) project description file (FoxPro)
.pjxl	Bitmap graphics (HP PaintJet XL PCL graphics file)
.pk	Packed bitmap font file (TeX DVI drivers)
.pka	Compressed file archive (PKArc)
.pkg	Installer script (Next)
.pkg	Package (AppleLink - MS Developer Studio)
.pkg	database (P-CAD)
.pkr	Public Keyring (PGP)
.pkt	Fidonet message packet
.pl	Palette (Harvard Graphics)
.pl	Perl script language source code file
.pl	Prolog language source code file
.pl	Property List font metric file (TeX)
.pl1	Room plan (3D Home Architect)
.pl3	Chart palette (Harvard Graphics 3.0)
.plb	Library (FoxPro - P-CAD)
.plc	Add-in file (functions - macros - applications) (Lotus 1-2-3)
.plc	Database (P-CAD)
.plg	Build log (MS Developer Studio)
.pll	Prelinked library (CA Clipper)
.pln	Spreadsheet (WordPerfect for Win)
.plot	Vector graphics (Unix Plot(5) format)
.plt	Palette
.plt	Paper format (Page Magic 2.0)
.plt	Pre-linked transfer file (Clipper 5)
.plt	Software platform file (Geoworks Glue)
.plt	Table for .pll (CA Clipper)
.plt	Vector graphics (HPGL plotter) (AutoCAD Plot)
.ply	Data (PopMail)
.ply	Presentation screen (Harvard Spotlight)
.ply	ZipPack
.pm	Bitmap graphics (8bit text) (X Window PixelMap)
.pm	Bitmap graphics (Presentation Manager)
.pm	Perl
.pm3	Document (PageMaker 3)
.pm4	Document (PageMaker 4)
.pm5	Document (PageMaker 5)
.pm6	Document (PageMaker 6)
.pma	Data (Performance Monitor)
.pmc	Data (Performance Monitor)
.pmc	Graphics (A4TECH Scanner)
.pmi	Program manager information (OS/2)
.pml	Data (Performance Monitor)
.pmm	Program file (Amaris BTX/2)
.pmr	Data (Performance Monitor)
.pmw	Data (Performance Monitor)
.pn3	Printer device driver (Harvard Graphics 3.0)
.pnf	Bitmap graphics (Portable Network graphics Frame) (standalone stream)
.pnf	Precompiled setup information (Windows)
.png	Bitmap graphics (Portable Network Graphics)
.pnm	Bitmap graphics (PBM Portable aNyMap)
.pnt	Bitmap graphics (Apple MacPaint format)
.pnt	Pointlist segment (FTN software)
.pnt	Qwk reader pointer file (MarkMail 2.x)
.pnt	Vector point data (ARC format)
.pntg	Bitmap graphics B&W (Apple Macintosh MacPaint file)
.poh	Optimized .goh include file (Geoworks)
.pol	Polygon Models Format (InnovMetric Software)
.pop	Messages index (PopMail)
.pop	Pop-up menu object (dBASE Application Generator)
.pot	Continuous potential image (Fractint)
.pot	Template (MS PowerPoint)
.pov	Raytraced graphics image (Persistance Of Vision)
.pow	Instrument or song file (PowerChords)
.pp	Compressed Amiga file archive (PowerPacker)
.pp4	Bitmap graphics (Picture Publisher 4)
.ppa	Add-in (MS PowerPoint)
.ppb	Button bar for Print Preview (WordPerfect for Win)
.ppd	PostScript printer description file (PageMaker)
.ppk	Archive (using for many distributives) (PPK)
.ppl	Polaroidpaletteplus ColorKey device driver (Harvard Graphics 3.0)
.ppm	Bitmap graphics (PBM Portable Pixel Map)
.ppo	Preprocessor output (CA Clipper 5.x)
.ppp	Publication (PagePlus)
.pps	Slide show (MS PowerPoint)
.pps	Storyboard (Personal Producer)
.ppt	Presentation (MS PowerPoint)
.pr	Bitmap graphics (Sun raster file)
.pr1	Data file (Packrat 4.0)
.pr2	Data file (Packrat 4.x)
.pr2	Presentation (Aldus Persuasion 2.x)
.pr2	Printer driver (dBASE IV)
.pr3	Postscript printer driver (dBASE IV)
.pr3	Presentation (Aldus Persuasion 3.x)
.prd	Printer driver (many)
.pre	Bitmap graphics (CMYK image) (Stork format)
.pre	Presentation (Lotus Freelance)
.pre	Settings (Programmer's WorkBench - MS C/C++)
.prf	Bitmap graphics (Pixel Run Format) (Improces - Fastgraph)
.prf	Data file (CheckIt Pro 1.0)
.prf	Printer driver (dBASE IV)
.prf	Profiler output
.prg	Program (Atari)
.prg	Program source (dBASE IV - FoxPro - CA Clipper - dBFast)
.pri	Printer definitions (LocoScript)
.prj	Project
.prm	Parameters
.prn	Printer driver (Signature)
.prn	Text file (Lotus 1-2-3 - Symphony)
.prn	Usually printer output file
.pro	Graphics profile file (DOS)
.pro	Profile (configuration data)
.pro	Prolog language source code file
.proj	Project File (Interface Builder) (NeXT)
.prr	The Perfect Resume data file (Perfect Resume)
.prs	Presentation (Harvard Graphics Win)
.prs	Printer Resource eg. fonts (WordPerfect for Win)
.prs	Procedure (dBASE IV)
.prt	Component (P-CAD)
.prt	PTC Pro/ENGINEER part
.prt	Printer driver (Dr.Halo)
.prvkr	Private keyring (PGP)
.prx	Compiled program (FoxPro)
.ps	Adobe Postscript document (text/graphics)
.ps2	Adobe Level II Postscript document (text/graphics)
.psa	Archive (Pretty Simple Archive) (GNU PSA.OUT)
.psd	Bitmap graphics (Adobe Photoshop format)
.psd	Definition file (Periscope Debugger)
.pse	Bitmap graphics (IBM printer Page SEgment)
.pseg	Bitmap graphics (IBM printer Page SEgment)
.psf	Outline PostScript printer font (ChiWriter)
.psid	Postscript image data (text/graphics) (ascii file)
.psm	Music format (Protracker Studio Module) (Protracker - MASI)
.psm	Symbol table of IDE (Turbo Pascal)
.psn	Presentation file (Sound Script)
.psp	Procedure (Prodea Synergy)
.pst	Paste buffer (Lahey Fortran)
.pst	Personal Folder File (Microsoft Outlook)
.pst	Postbox file (BMail)
.pt	Game crack (Player Tools)
.pt	Kodak Precition Color Management System
.pt	Sound (Pitch Track)
.pt3	Device driver (Harvard Graphics 3.0)
.pt3	Template (PageMaker 3)
.pt4	Template (PageMaker 4)
.pt5	Template (PageMaker 5)
.ptb	Script (PubTech BatchWorks)
.ptm	Macro (PubTech BatchWorks)
.ptm	Music format
.ptm	Template (Page Magic 2.0)
.ptr	Cursor image file (OS/2 PTR file)
.ptr	Qwk reader pointer file (QMail)
.ptu	Performer Terrain Utilities
.ptx	Bitmap graphics (Printronix graphics file)
.pub	Page template (MS Publisher)
.pub	Public keyring (Pretty Good Privacy)
.pub	Publication (Ventura Publisher - 1st Publisher)
.pubkr	Public Keyring (PGP)
.put	Compressed file archive (PUT)
.put	Graphics (WScan)
.puz	Puzzle file (BrainsBreaker Puzzle)
.puzz	Bitmap graphics (8bit) (X11 Puzzle)
.puzzle	Bitmap graphics (8bit) (X11 Puzzle)
.pv	Analysis data (Phase Vocorder)
.pvd	Script (Instalit)
.pvl	Library (Instalit)
.pvt	Local Fidonet pointlist (FTN software)
.pvu	Paleoenvironmental data (PaleoVu)
.pw	Text document (Professional Write)
.pwd	Text document (Microsoft Pocket Word)
.pwl	Password List
.pwp	Text document (Professional WritePlus)
.pwz	Wizard (MS PowerPoint)
.px	Primary database index (Paradox)
.pxl	Script (PiXCLscript)
.pxl	Spreadsheet (Microsoft Pocket Excel)
.pxp	Process file (3D Studio)
.pxr	Bitmap graphics (Pixar image) (Photoshop)
.py	Python script file
.pyc	Compiled PYTHON script file
.pzd	Default settings (Pizazz Plus)
.pzi	Graphics (Pizazz Plus)
.pzl	Bitmap graphics (8bit) (Unix Puzzle)
.pzo	Overlay (Pizazz Plus)
.pzp	Palette (Pizazz Plus)
.pzs	Settings (Pizazz Plus)
.pzt	Transfer file (Pizazz Plus)
.pzx	Swap file (Pizazz Plus)

[ q ]

.q0	Bitmap graphics (24bit) (Japanese Q0 image format)
.qad	Document (PF QuickArt)
.qag	Quick Access Group (Norton Desktop)
.qap	Application (Omnis Quartz)
.qbe	Saved query (Query By Example) (dBASE IV - Quattro Pro)
.qbo	Compiled query (dBASE IV)
.qbw	Spreadsheet (QuickBooks for Windows)
.qcp	Digitally encoded voice (Qualcomm QCELP recoder and player)
.qd0	Data file - segment 10 (Omnis Quartz)
.qd1	Data file - segment 1 (Omnis Quartz)
.qd2	Data file - segment 2 (Omnis Quartz)
.qd3	Data file - segment 3 (Omnis Quartz)
.qd3	QuickDraw 3D Metafile (QuickDraw)
.qd3d	QuickDraw 3D Metafile (QuickDraw)
.qd4	Data file - segment 4 (Omnis Quartz)
.qd5	Data file - segment 5 (Omnis Quartz)
.qd6	Data file - segment 6 (Omnis Quartz)
.qd7	Data file - segment 7 (Omnis Quartz)
.qd8	Data file - segment 8 (Omnis Quartz)
.qd9	Data file - segment 9 (Omnis Quartz)
.qdk	Backup of startup files created by Optimize (QEMM)
.qdv	Bitmap graphics (8bit) (Random Dot QDV file)
.qef	Query file (Q+E for MS Excel)
.qfx	Fax (QuickLink)
.qic	Backup set (MS Backup)
.qlb	Quick library (BASIC PDS - MS C/C++)
.qlc	ATM Type 1 fonts script (Adobe Type Manager)
.qlp	Printer driver (QuickLink)
.qm4	Options or services file (QMail 4.x Mail Door)
.qpr	Generated query program (FoxPro)
.qpr	Print queue device driver (OS/2)
.qpx	Compiled executable QBE query file (FoxPro)
.qrs	Equation Editor support file (WordPerfect for Win)
.qrt	Bitmap graphics (24bit) (QRT Raytracer)
.qry	Query (dBASE IV)
.qt	QuickTime movie (animation)
.qtc	QuickTime Conferencing
.qtk	Bitmap graphics (QuickTake digital camera)
.qtv	Movie (QuickTime Virtual Reality)
.qtvr	Movie (QuickTime Virtual Reality)
.que	Queue object (Scheduler)
.qwk	Qwk reader message file
.qxd	Document (QuarkXPress)
.qxl	Element library (QuarkXPress)
.qxt	Template (QuarkXPress)

[ r ]

.r	Ratfor file (FORTRAN preprosessor)
.r2d	Data file (Reflex 2)
.r8	Raw graphics (one byte per pixel) plane one (PicLab)
.r8	Red channel image data (24bit 3D animation) (Cubicomp PictureMaker)
.r8p	Pcl 4 bitmap font file (Intellifont)
.ra	Audio file (RealAudio)
.ra	Data file (Remote Access)
.rad	2-op FM music (Reality AdLib Tracker)
.rad	Radience
.ram	Audio file (RealAudio)
.rar	Compressed file archive (RAR)
.ras	Bitmap graphics (Sun raster image)
.rast	Bitmap graphics (Sun raster image)
.rat	Datafile (RATS)
.raw	Bitmap graphics (Raw 24-bit RGB)
.raw	Sound (Raw sound data) (PCM)
.ray	Rayshade
.rbf	Datafile (Rbase)
.rc	Configuration record (Emacs)
.rc	Resource script (MS C/C++ - Borland C++ - Resource WorkShop)
.rc2	Not editable resources (MS Developer Studio)
.rcg	Netscape newsgroup file (netsc.rcg)
.rct	Resource template (MS Developer Studio)
.rd3	Graphics (Ray Dream Designer 3)
.rdef	UI resource file (old) (Geoworks)
.rdf	Compiled UIC source code (Geoworks UI Compiler)
.rdi	Device-independent bitmap file (RIFF RDIB format)
.rdx	Datafile (Reflex)
.rec	Archivation protocol (ARCSERVE)
.rec	Datafile (EpiInfo)
.rec	Macro (Windows Recorder)
.rec	Record (Sprint)
.red	Path info (Clarion Modula-2)
.ref	Cross-reference
.reg	Registration information or key
.rem	Remarks
.rep	Reply file (Qwk reader)
.rep	Report file
.req	Request
.res	Compiled resource (MS C/C++ - Borland C++)
.res	Resign conferences file (XBoard)
.res	Resource
.rev	Revision file (Geoworks)
.rex	Executable file (old format) (PharLab)
.rex	Report definition (Oracle)
.rex	Rexx language source code file (Rexx)
.rez	Resource file
.rf	Bitmap graphics (Raster file)
.rfm	Rich music format
.rft	DCA/RFT Revisable Format Text file (IBM DisplayWrite 4.0-5.1)
.rg	Bitmap graphics (1bit B&W 4bit CMYK) (Raster Graphics format)
.rgb	Bitmap graphics (Raw 24bit Red-Green-Blue) (many)
.rgx	Symbol tables etc. info (ReaGeniX code generator)
.rh	Resource header (Borland C++, Visual C++)
.ri	Data (Lotus 1-2-3)
.rib	Graphics (Renderman Interface Bytestream) (3D Reality)
.ric	Fax (Ricoh)
.rif	Bitmap graphics (Resource Interchange File Format)
.riff	Bitmap graphics (Resource Interchange File Format)
.rip	Graphics (Remote Access)
.rip	Program crash report (Quincy)
.rip	Telegrafx Remote Imaging Protocol (Maximus 3.0)
.rix	Bitmap graphics (RIX Softworks Paint Tool ColoRIX file)
.rl4	Bitmap graphics
.rl8	Bitmap graphics
.rla	Bitmap graphics (Wavefront raster image file)
.rlb	Bitmap graphics (Wavefront raster image file)
.rlb	Data (Harvard Graphics Win)
.rlc	Bitmap graphics (Run Length RLC file)
.rld	Temporary file (Norton Commander 5.0)
.rle	Bitmap graphics (Utah Run-Length Encoded image file)
.rlz	Realizer source code file (CA-Realizer)
.rm	Audio file (RealAudio)
.rmf	Rich Music Format (Beatnik)
.rmi	Midi music (RIFF RMID format)
.rmk	Makefile (CA Clipper RMake)
.rmp	Audio file (RealAudio)
.rn	Xpl program (Nota Bene)
.rnd	Rendering Slide (AutoCAD AutoShade)
.rng	Ringing tone (Nokia Communicator)
.rnk	Diap-up shortcut
.rno	Runoff file (VAX)
.roff	Unformatted manual page (Roff/nroff/troff/groff)
.rol	Roland music file (Adlib)
.rom	Read Only Memory image (emulators - AONs)
.rov	Game data (Rescure Rover)
.rpb	Data report file (CP Backup)
.rpd	Database (RapidFile)
.rpf	Pattern (AutoCAD)
.rpl	Document (Replica)
.rpl	Reply message
.rpl	Text document (Replica)
.rpm	Plugin (RealAudio)
.rpt	Report
.rs	Data file (Amiga Resource - Reassembler)
.rs_	Resource fork of a Macintosh file (Mac-ette)
.rsc	Compiled resource(s)
.rsg	Compiled resource header (EPOC32)
.rsl	Resource Library (PC Tools Win)
.rsp	Response file
.rsrc	Resource
.rss	Resource source file (EPOC32)
.rt	Rich text
.rtf	Text document (Rich Text Format) (many)
.rtfd	RTF-Packet (NeXT)
.rtl	Bitmap graphics (HP Raster Transfer Language) (HP colour printers)
.rtl	Run-Time library (Norton Utilities)
.rtl	Text file
.rtp	Software update file (.RTPatch)
.rts	Runtime library (CA-Realizer)
.rtx	Text document (MIME Richtext format)
.rul	Rules (Echo-conference)
.run	Batch file (PC Tools)
.rus	Russian text
.rvw	Review
.rws	Resource Workshop Symbol file (Borland C++)
.rwx	MEME Shape File
.rwx	Script (Criterion RenderWare)
.rxd	Datafile (Reflex 1)

[ s ]

.s	Assembly language source code file.s (Unix)
.s	Macro source file (MultiEdit)
.s	Scheme language source code file
.s$$	Temporary sort file (Sprint)
.s1k	S1000 Simnet Format
.s3i	Sample file (Digiplayer - ST3)
.s3m	Music (16 channels) (Scream Tracker III)
.saf	Spatial Archive Interchange Format
.saif	Spatial Archive Interchange Format
.sal	Datafile (SORITEC)
.sam	Text file (Samna - Lotus Ami/Ami Pro)
.sar	Compressed file archive (SAR)
.sas	SAS source code file (VMS)
.sav	Saved backup or configuration data
.sav	Saved game situation (eg. NetHack)
.sb	Audio file (signed byte)
.sbd	Data file (Storyboard Editor)
.sbi	Sound Blaster Instrument (Creative Labs)
.sbk	Emu SoundFont Bank (AWE32 Bank) (Convert (c) Villena)
.sbk	Toolbook (Asymetrix ToolBook)
.sbl	library (Stonu Brook Pascal)
.sbp	Dml program (Superbase 4)
.sbr	Support file (Source Browser)
.sbt	Notes related to record (Suberbase 4 Windows)
.sc	Display driver (Framework II)
.sc	PAL script (Paradox)
.sc2	Document (MS Schedule+ 7.x)
.sc3	Renamed dBASE III screen mask file (dBASE IV)
.sc3	Screen device driver (Harvard Graphics 3.x)
.sca	Datafile (SCA)
.scan	Bitmap graphics (Thunderscan image file)
.scc	Bitmap graphics (MSX picture)
.scd	Bitmap graphics (SCODL Scan Conversion Object Description Language)
.scd	Contacts (MS Schedule+ 7.x)
.scf	Multimedia show (ScoreMaker)
.scf	Shell Command File (Windows Explorer)
.scf	Spelling checker configuration (Symphony)
.scg	Bitmap graphics (ColoRIX)
.sch	Project schedule (Schedule Publisher - MS Schedule+ 7.x)
.sch	Scheme (P CAD - Orcad)
.sci	Bitmap graphics (Scitex Continuous Tone (CT2T) image file)
.sci	Fax (SciFax)
.sci	System Configuration Information
.scm	Scheme language source code file
.scn	SCeNe RTrace
.scn	Screen dump or file (Kermit)
.sco	Score (best results)
.scodl	Bitmap graphics (Agfa slide file)
.scp	Bitmap graphics (ColoRIX)
.scp	Script (BITCOM)
.scr	Bitmap graphics (ColoRIX or Sun rasterfile)
.scr	Debug source code file (DOS Debug)
.scr	Fax image
.scr	Screen (source) file (Forth)
.scr	Screen font (LocoScript)
.scr	Screen saver (Windows 3.x)
.scr	Screen snapshop (Microsoft Screen Capture format)
.scr	Script (1st Reader - Kermit - TeleMate)
.sct	Additional (FPT) screen description file (FoxPro)
.sct	Bitmap graphics (Scitex CT bitmap)
.scu	Bitmap graphics (ColoRIX)
.scx	Chart (Stanford Chart)
.scx	Graphics bitmap (ColoRIX)
.scx	Main (DBF) screen description file (FoxPro)
.scy	Security file (ReaGeniX)
.scz	Data (Wingz)
.sd	Sound (Entropic Sound Data format)
.sda	Software Distribution Network file archive description
.sdf	Source definition file (Sourcer)
.sdf	System Data Format file (fixed lenght ascii text)
.sdi	Software Distribution Network Info file
.sdk	Roland S-550/S-50/W-30 Disk Image
.sdl	Parsys hardware network description file
.sdl	Scene Description Language (Alias Wavefront)
.sdl	SmartDraw library
.sdml	Spacial Data Modeling Language
.sdn	Software Distribution Network compressd file archive (pak251.exe)
.sdr	Music (Sounder)
.sdr	SmartDraw drawing
.sds	MIDI Sample DUMP Standard File
.sdt	SmartDraw template
.sdts	Spatial Data Transfer Standard
.sdw	Vector graphics (Ami Draw)
.sdx	Sample DUMP Exchange File
.sea	Self-extracting compressed Macintosh file archive (Compact Pro)
.sec	Diskreet encrypted file (Diskreet)
.sec	Secret key ring file (Pretty Good Privacy)
.sec	Secured animation file (Disney Animation Studio)
.sep	Printer separator page
.seq	Animation file (Atari)
.seq	Sequential Instruction File (Bubble Chamber)
.ses	Session info (Clarion Modula-2)
.set	Configuration (1st Reader)
.set	Driver sets created by Install (Symphony)
.set	Setup data or info
.sf	IRCAM Sound File (CSound package - MixView sound sample editor)
.sf	WPS attribute storage (OS/2 WorkPlace Shell)
.sfb	HP Soft font
.sff	Scene File Format
.sfi	Graphics (SIS Framegrabber)
.sfi	Printer font (HP LaserJet landscape) (Ventura Publisher)
.sfl	PCL 4 bitmap font (landscape) (Intellifont - Ventura Publisher)
.sfn	Font (SPX)
.sfo	Bitstream font file - fontware format
.sfp	Pcl 4 bitmap font (portrait) (Intellifont) (Ventura Publisher)
.sfs	Pcl 5 scalable font file (Intellifont)
.sft	Screen font (ChiWriter)
.sfw	Graphics (Seattle Film Works)
.sfx	Self-extracting file archive script (RAR)
.sg1	Graphics (Stanford Graphics)
.sgd	Help file (Lahey Blackbeard)
.sgf	Document with graphics (Starwriter)
.sgi	Bitmap graphics (Silicon Graphics Image)
.sgm	IETF SGML (Standard Generalized Markup Language)
.sgml	IETF SGML (Standard Generalized Markup Language)
.sgp	Statistics (STATGRAPHICS Plus)
.sgt	Save/get keyboard macro (Signature)
.sgx	Help file index (Lahey Fortran)
.sh	Shell script (unix) (ascii) (SHAR)
.sh3	Presentation (Harvard Graphics 3.0)
.shar	Shell Archive (Unix) (script)
.shb	Background (CorelShow)
.shb	Presentation (Corel Show)
.shb	Shortcut into a document (Windows 95)
.shd	Spool file (Windows95)
.shg	Bitmap graphics (Segmented HyperGraph)
.shk	Compressed Apple II file archive (ShrinkIt)
.shm	Shell macro (WordPerfect Library)
.shp	Icon library (Printmaster)
.shp	Shape file and source file for text fonts (AutoCAD)
.shr	Unix Shell ARchive (ascii) (SHAR)
.shs	Shell scrap object (Windows 95)
.shtml	Secure HTML file (WWW)
.shw	Presentation (Harvard Graphics - CorelShow)
.shx	Shape entities (AutoCAD)
.sid	C64 tunes and sound effects file (PlaySID)
.sif	Setup Installation File
.sif	Vector data (ISIF format)
.sig	Current program settings (Signature)
.sig	Signature file (ThunderByte AntiVirus - PopMail - PGP)
.sik	Backup file (Sicherungskopie) (MS Word)
.sim	SIMPLE script source (Telix)
.sir	Bitmap graphics (Solitaire file)
.sis	Software installation file (Psion)
.sit	Compressed Macintosh file archive (UnStuff)
.six	Bitmap graphics (DEC LN03+ Sixel file)
.sixel	Bitmap graphics (DEC LN03+ Sixel file)
.skcard	Datafile (Starfish SideKick)
.skr	Private (secret) keyring (PGP)
.sky	SYLK Spreadsheet file (Multiplan)
.sl	S-Lang language source code file
.slb	Slide library (AutoCAD)
.slb	Symbols library (P-CAD)
.slc	Compiled SALT script (Telix)
.sld	Slide (AutoCAD)
.sli	Slide (MAGICorp Slide Service)
.slk	Data format (Sylk Symbolic Link format)(Excel - MultiPlan)
.sll	Sound file
.slt	Salt Script Application Language script source (Telix)
.sm	Maillist (SoftSpoken Mailer)
.sm	Script (ScriptMaker)
.sm	Smalltalk language source code file
.sm	Text document (Samna Word)
.smf	Fax (SMARTFAX)
.smm	Macro (Ami Pro)
.smn	Font (ParaGraph's WorkScript format)
.smp	Data file (Samplevision)
.smp	Sample file (sound)
.smt	Text file (Smart Ware II)
.sn	Compressed song file (Sound Club editor)
.snd	Sound file (Sun/NeXT/Tandy/Apple Macintosh Sound file formats)
.sng	Song (midi sound) (Midisoft Studio - Prism)
.sno	Snobol4 language source code file
.snp	Book-shelf for .BOO (READIBM)
.snp	Output video format from Computer Eyes equipment
.so	Shared object (Fortran 90)
.sol	MATRA prelude solids
.sol	Solution eg. game walkthroughs
.som	Network serial numbers (Quattro Pro)
.som	Sort information (Paradox)
.son	Song (SBStudio II)
.sou	Sound data (SBStudio II)
.sp	Compressed file archive (Splint)
.spc	Bitmap graphics (Atari compressed Spectrum file)
.spc	Program (MS Multiplan)
.spc	Temporary file (WordPerfect for Win)
.spc	Text to speech
.spd	Scalable font (Speedo) (Harvard Graphics 3.0)
.spf	Slide presentation file (EnerGraphics)
.spg	Glossary (Sprint)
.sph	Sphere
.spiff	Graphics (Still Picture Interchange File Format)
.spk	Compressed file archive (Spark) (Acorn)
.spl	Compressed file archive (Splint)
.spl	Customized printer driver (Sprint)
.spl	Personal spell dictionary (Signature)
.spl	Sample
.spl	Splash (Macromedia)
.spl	Spool file (Windows 3.x printing)
.spm	Data (WordPerfect)
.spot	Bitmap graphics (SPOT satellite image file)
.spp	Printer file (Sprint)
.spr	Animation (Sizzler)
.spr	Document letter (Sprint)
.spr	Generated executable screen file (FoxPro)
.spr	Spreadsheet (Psion Series 3)
.spr	Sprite (graphics image) (many - Story Board)
.sprite	Animation (Sizzler)
.sps	SPSS language source code file (VAX/VMS)
.sps	Screen driver (Sprint)
.spt	Data support file (MITAC disk/system management utility pack)
.spt	Spitbol language source code file
.spt	Split (one part of multi-part file)
.spt	Support file (MITAC disk/system management utility pack)
.spu	Bitmap graphics (Atari compressed Spectrum file)
.spw	Worksheet (SigmaPlot)
.spx	Compiled executable screen file (FoxPro)
.spx	Screensaver (Screen Peace) (Windows)
.sqd	Squish message base (Squish)
.sqi	Squish message base index (Squish)
.sql	SQL report or query
.sql	Squish message base last read pointers (Squish)
.sqz	Compressed file archive (Squeeze)
.sr	Bitmap graphics (Sun Rasterfile)
.src	Multi-edit source (Multi-Edit)
.src	Source (DataFlex)
.srf	Bitmap graphics (Sun Raster File)
.srp	Script (QuickLink)
.ss	Bitmap graphics (Splash)
.ss	Screen saver (DN)
.ssd	Datafile (SAS/PC)
.ssh	Secure Shell document (DataFellows)
.ssp	Datafile (SAS Transport)
.ssq	ODBC script
.sst	Satellite image data (AVHRR file) (IDIDAS - SSTMAP - IMGMAP)
.st	Instrument library (Scream Tracker)
.st	Smalltalk language source code file (Little Smalltalk)
.st	Stamp (NeoPaint)
.sta	Data file (Statistica)
.sta	Saved state (Reflection 4.0)
.sta	Stack (Spinmaker Plus)
.stb	Stub library (Genus GX Kernel)
.std	Standard (something..) (LocoScript)
.std	State Transition Diagram graphics file (Prosa)
.step	ISO-10303 STEP product data
.stf	Compressed file archive (ShrinkToFit)
.stl	Stereolithography Interface Format
.stm	Music (4 channels) (Scream Tracker II)
.stm	State Transition Diagram model file (Prosa)
.sto	Pascal stub OBJ file (Genus GX Kernel)
.stp	ISO-10303 STEP product data
.str	Gate3 table structure file
.str	Structure list object file (dBASE Application Generator)
.sts	Project status info (MS C/C++)
.sts	Song format (Scream Tracker)
.stw	Data file (SmartTerm for Windows)
.stx	Electronic book (SmarText)
.stx	Music format
.stx	Tax form (CA-Simply Tax)
.sty	Style library or sheet (many text and graphics programs)
.sui	Suit library (Simple User Interface Toolkit)
.sum	Summary
.sun	Raster graphics (Sun Rasterfile)
.suniff	Bitmap graphics (Sun TAAC Image File Format)
.sup	Bitmap graphics (Startup screen)
.sup	Supplementary dictionary (WordPerfect for Win)
.svd	Document autosave file (MS Word)
.svf	Vector graphics (Simple Vector Format) (CAD programs)
.svg	Glossary autosave file (MS Word)
.svq	Music file
.svr	Virtual world (compressed) (WWW)
.svs	Style sheet autosave file (MS Word)
.svx	Sound (Amiga 8SVX format)
.sw	Audio file (signed word)
.swa	Music (MPEG-1 Layer III with special header) (Macromedia Shockwave)
.swf	Flash (Macromedia)
.swg	SWAG Pascal Snippets file (SWAG Reader)
.swp	Document backup (Sprint)
.swp	Swap file
.sxp	Process file (3D Studio)
.sy1	Smartpix symbol library (Ami Pro)
.sy3	Symbol file (Harvard Graphics 3.x)
.syd	Backup (QEMM - Sysedit)
.syk	SYLK spreadsheet format (Excel)
.sylk	SYLK spreadsheet format (Excel)
.sym	Component symbols (P-CAD)
.sym	Graphics symbols (Harvard Graphics 2.0 - MS Windows SDK)
.sym	Precompiled headers (Borland C++)
.sym	Program symbol table (many compilers and linkers)
.syn	Bitmap graphics (SDSC Synu image file)
.syn	Synonym file (MS Word 5)
.synu	Bitmap graphics (SDSC Synu image file)
.sys	Datafile (SYGRAPH - SYSTAT - SPSS/PC)
.sys	System file - device driver or hardware configuration info (DOS)
.syw	Graphics symbols (Harvard Graphics Win)
.syw	Yamaha SY-85/SY-99 Wave File

[ t ]

.t	Tads source
.t	Tape Archive without compression (tar)
.t	Tester symbol table (ReaGeniX code generator)
.t	Unformatted manual page (Roff/nroff/troff/groff)
.t44	Temporary file for Sort or Index (dBASE IV)
.t64	Commodore 64 emulator tape file (C64S emulator)
.taac	Bitmap graphics (Sun TAAC Image File Format)
.tab	Colour lookup table (CMYK image) (Stork format)
.tag	Query tag name (DataFlex)
.tah	Help file (Turbo Assembler)
.tal	Text illustration (TypeAlign)
.talk	Text to speech
.tap	Tape file (ZX Spectrum emulator by g.a.lunter)
.tar	Compressed file archive (tar)
.targa	Bitmap graphics (Truevision Targa format)
.taz	Compressed file.tar.Z archive (ascii) (tar and compress)
.tb1	Font file (Borland Turbo C)
.tb2	Font file (Borland Turbo C)
.tbf	Fax (Imavox TurboFax)
.tbk	Memo backup (dBASE IV - FoxPro)
.tbk	Toolbook (Asymetrix ToolBook)
.tbl	Table
.tbr	Custom toolbar (Norton Desktop)
.tbs	Text elements (Textbausteine) (German MS Word)
.tbx	Table (Project Scheduler 4)
.tc	Configuration (Turbo C - Borland C++)
.tc	Termcap
.tch	Help file (Turbo C - Borland C++)
.tcl	Tcl (Tool Command Language) script source code
.tco	T9000 object modules
.tcw	Drawing (TurboCAD for Windows)
.td	Configuration file (Turbo Debugger for DOS)
.td0	Disk image (compressed diskette in a file) (Teledisk)
.td2	Configuration file (Turbo Debugger for Win32)
.tdb	Database (TACT)
.tddd	Imagine Object File Format
.tdf	Font (TheDraw)
.tdf	Typeface definition file (Speedo)
.tdh	Help file (Turbo Debugger)
.tdi	Animation (TDI image file)
.tdk	Keystroke recording file (Turbo Debugger)
.tdr	Contens of Arvid tape
.tds	Symbol table (Turbo Debugger)
.tdw	Configuration file (Turbo Debugger for Windows)
.tdw	Debugger symbol table (Borland C++ Builder)
.tef	Fax (Relisys TEFAX)
.tel	Host file (Telnet)
.tem	Input template (IconAuthor)
.tem	Turbo Editor Macro Language script (Borland C++)
.tet	Tetris results (DN)
.tex	Datasheet (Idealist)
.tex	Text document (TeX Device Independent File Format) (Scientific Word)
.tex	Texture file (possible graphics)
.text	Text file
.tf	Configuration (Turbo Profiler)
.tf	MUD client macro (TinyFugue)
.tfa	Area file (Turbo Profiler)
.tfc	Catalogue file (Tobi's Floppy Cataloguer)
.tfh	Help file (Turbo Profiler)
.tfm	Tagged font metric file (Intellifont - TeX)
.tfs	Statistical information (Turbo Profiler)
.tg	Technical Guidance (NRC Inspection Manual)
.tg1	Project file (On Target)
.tga	Bitmap graphics (Truevision Targa format)
.tgz	Compressed file archive.tar.gz (tar and GNUzip)
.theme	Desktop theme (Windows 95)
.thm	Bitmap graphics (Picture Publisher - PhotoMagic Thumbnail)
.thn	Thumbnail (Graphics Workshop for Windows)
.thor	Database description (THOR database)
.ths	Thesaurus dictionary (WordPerfect for Win)
.ti	Temporary Instruction (NRC Inspection Manual)
.tic	FTN special file with assotiated file description (ALLFIX)
.tif	Bitmap graphics (Tagged Image File Format) (PageMaker - CorelDraw)
.tiff	Bitmap graphics (Tagged Image File Format) (PageMaker - CorelDraw)
.tig	Tiger file (US government distributed maps)
.til	Fuzzy logic knowledge base (Togai InfraLogic Fuzzy-C Compiler)
.tis	Tile set (MahJongg 3.0)
.tjl	Backup file (VAXTPU editor)
.tlb	OLE Type library (Visual C++)
.tlb	Reference table (Bubble Chamber)
.tlb	Text library (VAX)
.tlc	Compiled Tool Command Language source code (Geoworks Swat)
.tld	Disk Image (Teledisk)
.tlp	Project (TimeLine)
.tm	Bitmap graphics (EOSAT's Landsat Thematic Mapper data file)
.tmf	Tagged Font Metric file (WordPerfect for Win)
.tmo	Ztg global optimizer default output file (Zortech C++)
.tmp	Temporary file
.tms	Script (Telemate)
.tms	TeleMate compiled script (TeleMate)
.tny	Bitmap graphics (Atari TINY Bitmap)
.toc	Table Of Contents (index file)
.tok	External tokens (Borland C++ 4.x)
.tos	Self-extracting file archive (Atari ST)
.tp	Configuration (Turbo Pascal)
.tp	Session-state file (Turbo Profiler)
.tp3	Template (Harvard Graphics 3.0)
.tpb	Downloadable PCL Soft font file backup (HiJaak)
.tpf	Downloadable PCL Soft font file (HiJaak)
.tph	Help file (Turbo Pascal)
.tpl	Resident units library (Turbo Pascal)
.tpl	Template (Harvard Graphics - GoldEd -ITrack)
.tpp	Protected Mode Units (Borland Pascal 7.0)
.tpu	Command file (VAXTPU editor)
.tpu	Pascal Unit (DOS library) (Borland Pascal)
.tpw	Pascal Unit (Windows library) (Borland Pascal)
.tpw	Session-state file (Turbo Profiler for Windows)
.tpz	Compressed file archive.tar.gz (tar and GNUzip)
.tr	Session-state settings (Turbo Debugger for DOS)
.tr	Unformatted manual page (Roff/nroff/troff/groff)
.tr2	Session-state settings (Turbo Debugger for Win32)
.trc	Debug support file (Power CTrace)
.tre	Directory tree file (PC-Tools)
.trif	Bitmap graphics (Tiled Raster Interchange Format)
.trk	Track (i.e. video sequence) used by many games
.trm	Terminal settings (Windows 3.x)
.trn	Translation support file (Quattro - Clarion)
.trs	Executable file (Micrografx)
.tru	True Basic language source code file
.trw	Session-state settings (Turbo Debugger for Windows)
.tsm	Manual (Turbo Assembler for OS/2)
.tsq	ODBC script
.tst	Printer test file (WordPerfect for Win)
.tsv	Tab Separated Values
.ttf	Truetype Font (font file)
.tud	Document (The Ultimate Draw)
.tut	Tutorial
.tv	Table view settings (Paradox)
.tv1	Overflow file above insert point in Doc 1 (WordPerfect for Win)
.tv2	Overflow file above insert point in Doc 2 (WordPerfect for Win)
.tv3	Overflow file above insert point in Doc 3 (WordPerfect for Win)
.tv4	Overflow file above insert point in Doc 4 (WordPerfect for Win)
.tv5	Overflow file above insert point in Doc 5 (WordPerfect for Win)
.tv6	Overflow file above insert point in Doc 6 (WordPerfect for Win)
.tv7	Overflow file above insert point in Doc 7 (WordPerfect for Win)
.tv8	Overflow file above insert point in Doc 8 (WordPerfect for Win)
.tv9	Overflow file above insert point in Doc 9 (WordPerfect for Win)
.tvf	Table view settings (dBASE)
.twf	Data (TabWorks)
.tww	Tagwrite Template
.tx8	8-bit ASCII text
.txf	Compressed file archive.tar.f (tar and Freeze)
.txi	Support file (TeX)
.txt	Plain text (ASCII or ISO Latin 1 format)
.txw	Yamaha TX-16W Wave File (Convert (c) Villena)
.tym	Time Stamp (PageMaker 4)
.tz	Compressed file archive.tar.Z (tar and compress)
.tzb	Compressed file archive.tar.Z.btoa (tar - compress - btoa)

[ u ]

.u	Bitmap graphics (subsampled raw YUV file)
.u4a	UnInstaller archive
.u8	Sample
.ub	Music file (unsigned byte)
.uc2	Compressed file archive (UltraCompressor II)
.ucd	Use case diagram (Prosa/OM)
.ucn	New compressed file archive (UltraCompressor II)
.udf	Filter (Photostyler)
.udf	Uniqueness Database File (Windows NT)
.ue2	Encrypted file archive (UltraCompressor II)
.ufo	Ulead File for Objects (Ulead PhotoImpact)
.uhs	Universal Hint System (binary file)
.ui	Espire language source code file (Geoworks UI Compiler)
.ui	User interface (Sprint)
.uif	Long prompts for windows (WordPerfect for Win)
.uih	Espire header file (Geoworks UI Compiler)
.uil	Bitmap graphics (Motif UIL icon file)
.ul	Music file (Ulaw)
.uld	Uploaded file information (Procomm Plus)
.ult	Music (UltraTracker)
.umb	Backup file (MemMaker)
.uni	Datafile (Forecast Pro)
.uni	Music (UniMOD - MikMOD)
.unv	SDRC I-DEAS file
.unx	Text file containing UNIX specific info
.upd	Update info
.upf	Bitmap graphics (Universal Picture Format)
.upo	Compiled update data (dBASE)
.uri	List of Uniform Resource Identifiers (WWW)
.uris	List of Uniform Resource Identifiers (WWW)
.url	Internet shortcut (Universal Resource Locator)
.urt	Bitmap graphics (Utah Run-Length Encoded image file)
.use	Log file
.usp	Printer font with US Ascii extended character set (PageMaker)
.usr	User database (Procomm Plus - Turbo C++ tour)
.ustar	Compressed file archive (POSIX tar)
.uu	Encoded file archive (ascii) (uudecode - uuencode)
.uud	Encoded file archive (ascii) (uuencode)
.uue	Encoded file archive (ascii) (uuencode)
.uw	Music file (unsigned word)
.uwf	Music file (UltraTracker WaveSample)

[ v ]

.v	Bitmap graphics (subsampled raw YUV file)
.v	Consistency check support file (ReaGeniX code generator)
.v	Main input file for an image (Vivid 2.0)
.val	Validity checks and referential integrity (Paradox for Windows)
.val	Values list object file (dBASE Application Generator)
.van	Animation (VistaPro)
.vap	Value Added Process (NetWare 2.xx)
.var	Variable file (IconAuthor)
.vbp	Visual Basic Project
.vbr	Visual Basic Custom Control file (Visual Basic)
.vbx	Visual Basic eXtension (custom control)
.vbz	Visual Basic Setup Wizard Template (Setup Wizard)
.vc	Include file with color definitions (Vivid 2.0)
.vc	Spreadsheet (VisiCalc)
.vca	Visual Clip Art
.vcf	Vevi Configuration File (WorldToolKit objects)
.vcr	VCR driver (Arvid)
.vcs	Calendar data (Netscape Calendar)
.vcw	Visual workbench information (MS Visual C++)
.vcx	Spreadsheet (VisiCalc Advanced)
.vda	Bitmap graphics (Truevision Targa format)
.vda	Graphics (VDA-FS surface data)
.vdi	Bitmap graphics (Digital Research GEM VDI file)
.vdo	Video image (Story Board)
.vdr	Drawing (ComputerEasy Draw)
.veh	Vector data (SPANS VEH/VEC format)
.vew	GroupWise for Windows
.vew	View file (Clipper 5 - Lotus Approach)
.vfa	Database file (FontLab)
.vff	Bitmap graphics (DESR VFF Greyscale Image)
.vff	Bitmap graphics (Sun TAAC Image File Format)
.vfm	Ventura Font Metrics file (Ventura Publisher)
.vfm	Voting Form (Voter)
.vfn	Voting Form for Customers (Voter)
.vga	Bitmap graphics (OS/2 bitmap)
.vga	Vga display font
.vgd	Vga display driver (Generic CADD)
.vgr	Graphics (Ventura Publisher)
.vi	Bitmap graphics (Jovian Logic VI video capture board)
.vi	Script (Watcom Vi editor)
.vic	Graphics (VICAR - Video Image Communication and Retrieval)
.vicar	Graphics (VICAR - Video Image Communication and Retrieval)
.vid	Bitmap graphics (YUV12C M-Motion Frame Buffer file)
.vid	Screen device driver (MSDOS - Word)
.vif	Bitmap graphics (1bit CCITT Group 4) (Verity Image Format) (Topic)
.vif	Bitmap graphics (Khoros Visualization Image File Format)
.viff	Bitmap graphics (Khoros Visualization Image File Format)
.vik	Graphics (Viking)
.vir	Virus or infected file
.vis	Graphics (Vista)
.vit	Bitmap graphics (VITec file)
.vlb	Corel Ventura Library
.vlm	Virtual Loadable Module (Netware)
.vm	Virtual Memory file (or localization file) (Geoworks)
.vmc	Virtual memory configuration (DOS/4GW PM 32X DOS Extender)
.vmf	Font characteristics (Ventura Publisher)
.vms	Text file containing VMS specific info
.vo	Include file with object definition (Vivid 2.0)
.voc	Sound (Creative Lab's Sound File) (PlayVoc)
.vof	Object folder (VZ Programmer)
.vort	Bitmap graphics (Very Ordinary Rendering Toolkit)
.vp	Publication (Ventura Publisher)
.vp	Video posting (3D Studio)
.vpf	Vector Product Format
.vpg	Graphics (VPGraphics)
.vph	Virtual Pascal Help (VP/OS2)
.vpi	Virtual Pascal Unit (VP/OS2)
.vpr	Resource (Visual Prolog)
.vrm	Overlay file (QuattroPro)
.vrm	Virtual Reality Modeling Language (WWW)
.vrm	Visual Rexx language source code file (Watcom VRexx)
.vrml	Virtual Reality Modeling Language (WWW)
.vrp	Project (WATCOM VXRexx)
.vrs	Video Resource (device driver) (WordPerfect)
.vrt	Virtual world (WWW)
.vs	Include file with surface definition (Vivid 2.0)
.vsd	Drawing (Visio)
.vsm	Simulation model (VisSim)
.vsp	Sprite (SPX)
.vss	Smartshapes file (Visio)
.vst	Bitmap graphics (Truevision Vista)
.vst	Template (Visio)
.vsw	Data (Visio Workspace)
.vue	Animation (3D Studio)
.vue	View (dBASE IV - FoxPro)
.vw	Text file (Volkswriter)
.vwr	File viewer file (PC Tools)
.vxd	Virtual device driver (MS Windows)

[ w ]

.w	Word chart file (APPLAUSE)
.w30	Printer font (AST TurboLaser) (Ventura Publisher)
.w31	Startup file (Windows 3.1)
.w44	Temporary file for Sort or Index (dBASE)
.w51	Document (WordPerfect 5.1)
.w60	Document (WordPerfect 6.0)
.w61	Document (WordPerfect 6.1)
.w95	Microsoft Windows95 related file
.wad	War Allocation Daemon (Doom - Doom2)
.was	Script file (source code) (ProComm)
.wav	Sound (RIFF WAVE waveform audio format) (Media Player)
.wax	Compiled script (ProComm)
.wb1	Notebook (Quattro Pro)
.wb2	Spreadsheet (Quattro Pro)
.wbf	Windows Batch File (Catch)
.wbk	Backup (MS Word)
.wbk	Document/workbook (WordPerfect for Win)
.wbl	Upload file (Argo WebLoad II)
.wbt	Batch file (WilsonWare WinBatch)
.wcd	Macro token list (WordPerfect for Win)
.wch	Macro facility file (WordPerfect)
.wcm	Data transmission file (MS Works)
.wcm	Macro (WordPerfect for Win)
.wcp	Product information description (WordPerfect for Win)
.wd	Data file (InfoSelect)
.wdb	Database (MS Works)
.web	Web document (Corel Xara)
.weboogl	Web Object Oriented Graphics Library
.wfm	Form object (dBASE Form Designer)
.wfn	Windows 3.0 font file (CorelDraw)
.wfx	Data file (Winfax)
.wg1	Worksheet (Lotus 1-2-3/G)
.wg2	Worksheet (Lotus 1-2-3 for OS/2)
.wgp	Game data (Wild Board Games)
.whip	Bitmap graphics (WHIP file)
.wid	Width table (Ventura Publisher)
.wil	Data (WinImage)
.win	Window file (FoxPro - dBASE)
.wins	Makefile for WINS (EPOC32)
.wiz	Page wizard (MS Publisher - MS Word)
.wiz	Wizard (MS Word)
.wk1	Spreadsheet (Lotus 123 version 2.x - Symphony 1.1+)
.wk3	Spreadsheet (Lotus 123 version 3.x)
.wk4	Spreadsheet (Lotus 123 version 3.4)
.wkb	Document (WordPerfect for Win)
.wke	Spreadsheet (Lotus 123 educational version)
.wki	Spreadsheet format (Lotus 123 2.x)
.wkq	Spreadsheet (Quattro)
.wks	Document (Microsoft Works)
.wks	Spreadsheet (Lotus 123 version 1A - Symphony 1.0 - MS Works)
.wks	Workspace (Xlisp)
.wkz	Spreadsheet (Wingz)
.wlf	Upload file (Argo WebLoad I)
.wlk	Graphics (Virtus Walkthrough)
.wll	Add-in (MS Word)
.wmc	Backup of startup files (MathCad)
.wmc	Macro file (WordPerfect for Win)
.wmc	Text file (WordMARC)
.wmf	Vector graphics (Windows MetaFile format)
.wml	Wireless Markup Language document (WAP)
.wmp	Graphics (Windows Magic Icon Palette)
.wn	Text document (NeXT WriteNow)
.wnf	Outline font description (CorelDraw native format)
.woa	Swap file (Windows 3.x)
.wob	Object file (RIO Designer Pro)
.woc	Organization (Windows OrgChart)
.wow	Music (8 channels) (Grave Mod Player)
.wp	Text document (WordPerfect 4.2)
.wp4	text document (WordPerfect 4.x)
.wp5	Text document (WordPerfect 5.x)
.wp6	Text document (WordPerfect 6.x)
.wpd	Text document (WordPerfect 6.0 - PFS:WindowWorks)
.wpd	Windows printer driver
.wpf	Fax (WorldPort)
.wpf	Form (WordPerfect)
.wpg	Bitmap graphics (WordPerfect Graphics Format)
.wpg	Vector graphics (WordPerfect Graphics Format)
.wpj	Project (Watcom C/C++)
.wpk	Macros (WordPerfect for Win)
.wpm	Macros (WordPerfect)
.wpm	Text document (WordPerfect for Mac)
.wps	Text document (MS Works)
.wpt	Template (WordPerfect)
.wpw	Document (Novel PerfectWorks)
.wq!	Compressed spreadsheet (Quattro Pro)
.wq1	Spreadsheet (Quattro Pro DOS)
.wq2	Spreadsheet (Quattro Pro 5 DOS)
.wr1	Spreadsheet (Symphony 1.1 - 1.2 - 2)
.wrd	Template (Charisma)
.wrd	Text document (Psion Series 3)
.wri	Text document (Windows Write)
.wrk	Spreadsheet (Symphony 1.0)
.wrl	3D virtual reality object (VRML worlds) (Cosmo Player)
.wrp	Compressed Amiga file archive (Warp)
.wrs	Windows Resource eg. printer driver (WordPerfect for Win)
.wrz	VRML worlds (Cosmo Player)
.ws	APL Worksheet
.ws	Text document (WordStar 5.0-6.0)
.ws1	Text document (WordStar for Windows 1)
.ws2	Text document (WordStar 2000 - WordStar for Windows 2)
.ws3	Text document (WordStar for Windows 3)
.ws4	Text document (WordStar for Windows 4)
.ws5	Text document (WordStar for Windows 5)
.ws6	Text document (WordStar for Windows 6)
.ws7	Text document (WordStar for Windows 7)
.wsc	Scene file (RIO Designer Pro)
.wsd	Document (WordStar)
.wsp	Workspace (Fortran PowerStation)
.wsq	Wavelet-packet Scalar Quantization Format
.wsrc	x-wais source
.wst	Text document (WordStar)
.wtk	URL address of person to talk to (WinTalk)
.wtx	Text document
.wve	Sound (8kHz) (Psion Series 3 palmtop)
.wvl	Bitmap graphics (Wavelet Compressed Bitmap)
.wwb	Button bar for document window (WordPerfect for Win)
.wwk	Keyboard layout (WordPerfect for Win)
.wxp	Document (EXP for Windows)

[ x ]

.x	Archive (X1)
.x	Bitmap graphics (24bit) (AVS X image file)
.x	Lex language source code file
.x	Self-extracting archive (Alysis SuperDisk)
.x	X-file animation (Direct3D) (DeepV2)
.x01	Secondary index (Paradox)
.x02	Secondary index (Paradox)
.x03	Secondary index (Paradox)
.x04	Secondary index (Paradox)
.x05	Secondary index (Paradox)
.x06	Secondary index (Paradox)
.x07	Secondary index (Paradox)
.x08	Secondary index (Paradox)
.x09	Secondary index (Paradox)
.x10	Bitmap graphics (X Window dump)
.x11	Bitmap graphics (X Window dump)
.x3d	x3d and xdart Formats
.xar	Drawing (Corel Xara)
.xbm	Bitmap graphics (1bit text) (X Window BitMap)
.xc	Bitmap graphics (Constant image of X server screen)
.xck	Extended crack file (usually text)
.xcl	Script file (Xtree for Win)
.xdf	Extended disk format image (OS/2 xdfcopy.exe)
.xfn	Printer font (Xerox 4045) (Ventura Publisher)
.xfr	Bitmap editor font file (Ventura Publisher)
.xft	24 pin printer font (ChiWriter)
.xgl	Graphics language file (MegaBitz)
.xgz	Vector drawing (MegaBitz)
.xi	Instrument file (Fastracker 2.0)
.xif	Graphics (eXtended Image File Format)
.xim	Bitmap graphics (X11 Xim Toolkit file)
.xl	Spreadsheet (Excel)
.xla	Add-in macro sheet (MS Excel)
.xla	Xlib Archive (Xlib graphics library)
.xlb	Worksheet (MS Excel)
.xlc	Chart (MS Excel)
.xld	Dialog sheet (MS Excel)
.xlk	Backup (MS Excel)
.xll	XLL add-in (MS Excel)
.xlm	Macro (MS Excel)
.xls	Spreadsheet (MS Excel)
.xlt	Template (MS Excel)
.xlt	Translation table (Lotus 1-2-3 - Symphony - Procomm Plus)
.xlv	VBA Module (MS Excel)
.xlw	Workspace (MS Excel)
.xm	Music (FastTracker - Cubic Player)
.xmi	Compressed eXtended MIdi music
.xml	XML document (Extensible Markup Language)
.xmz	XGL movie (MegaView)
.xnf	Standard Network File form
.xnk	Shortcut (MS Exchange)
.xof	RenderMorphics
.xos	Bitmap graphics (Xaos Tools image file)
.xpm	Bitmap graphics (8bit text) (X11 pixmap file)
.xqt	Executable file (Waffle)
.xqt	Macro sheet (SuperCalc)
.xr1	Game data (Epic MegaGames Xargon)
.xref	Cross reference (AIX as)
.xrf	Cross-reference file
.xt	Music track (FastTracker)
.xtb	External translation table (LocoScript)
.xtp	Overlay (XTreeGold)
.xv	Bitmap graphics (Khoros Visualization Image File Format)
.xwd	Bitmap graphics (X Window Dump screen window image format)
.xwk	Keyboard mapping (Crosstalk)
.xwp	Session (Crosstalk)
.xwp	Text document (Xerox Writer)
.xx	Encoded file archive (ascii) (xxdecode - xxencode)
.xxe	Encoded file archive (ascii) (xxencode)
.xy	Text document (XY Write)
.xy3	Text document (XYWrite III)
.xy4	Text document (XYWrite IV)
.xyp	Text document (XYWrite III Plus)
.xyw	Text document (XYWrite for Windows 4.0)

[ y ]

.y	Bitmap graphics (subsampled raw YUV file)
.y	Compressed Amiga file archive (Yabba)
.y	Grammar file (Yacc)
.y01	Secondary index (Paradox)
.y02	Secondary index (Paradox)
.y03	Secondary index (Paradox)
.y04	Secondary index (Paradox)
.y05	Secondary index (Paradox)
.y06	Secondary index (Paradox)
.y07	Secondary index (Paradox)
.y08	Secondary index (Paradox)
.y09	Secondary index (Paradox)
.yal	Clipart library (Arts & Letters)
.ybk	Yearbook (Microsoft Encarta)
.ybm	Bitmap graphics (Face file)
.yc	Archive (YACC)
.yif	Graphics (color with lookup table)
.yuv	Bitmap graphics (Abekas YUV file or CCIR 601 1:1:1 file)
.yuv3	Bitmap graphics (CCIR 601 2:1:1 files)
.yz	Compressed file archive (YAC)

[ z ]

.z	Compressed file archive.Z (ascii) (compress)
.z	Compressed file archive.z (binary) (Unix SysV pack)
.z3	Infocom game module
.z80	Snapshot (ZX Spectrum emulator by g.a.lunter)
.zad	Digitized voice file (ZFax)
.zdg	Compressed ZiffNet text document (Zview)
.zeiss	Bitmap graphics (Zeiss CSLM file)
.zer	Data file (Zerberus)
.zfd	Zeroadic functions (ABC programming language)
.zgm	Graphics (Zenographics)
.zinc	Bitmap graphics (Zinc Interface Library icon file)
.zip	Compressed file archive (InfoZIP - PKZip - WinZip)
.zom	Compressed Amiga file archive (Zoom)
.zoo	Compressed file archive (Zoo)
.zpd	Zeroadic predicates (ABC programming language)
.zrp	Rapid simulation package (Rapid)
.zts	Script (Z-Term)
.zvd	Zyxel Voicefile (Z-Fax)
.zw	Chinese text
.zze	Encoded file archive (ascii)

[ ~ ]

.~$~	Temporary file (1st Reader)
.~ap	Old AppExpert project database (Borland C++ 4.x)
.~de	Project backup (Borland C++ 4.x)
.~mn	Menu backup (Norton Commander)

[ Ѓ ]

.Ѓ$Ѓ	Temporary file (1st Reader)