Here you will find nearly all file extensions used in your computer software.

Click on any of the letters to see its extension and software name

.a - library (unix)

.ad - screen saver data (AfterDark)

.adi - graphics (AutoCAD)

.adl - MCA adapter description library (QEMM)

.afi - Truevision bitmap graphics

.afm - Type 1 font metric ASCII data for font installer (ATM - many)

.all - format file for working pages (Always)

.all - general printer information (WordPerfect for Win)

.ani - animation (Presidio - many)

.anm - animation (Deluxe Paint Animator)

.ans - ANSI graphics (character animation)

.ans - ASCII text ANSI character set (NewWave Write)

.asc - ASCII text file

.avi - Audio Video Interleaved animation file (Video for Windows)

.bak - backup file

.bas - BASIC source code file

.bat - batch file (DOS)

.bbm - brush (Deluxe Paint)

.bbs - Bulletin Board System announce or text info file

.bch - batch process object file (dBASE Application Generator)

.bcp - Borland C++ makefile

.bdf - Bitmap Distribution Format font file (X11)

.bga - bitmap graphics

.bib - bibliography (ASCII)

.bib - database - not compatible with TeX format (Papyrus)

.bib - literature database (TeX/BibTeX)

.bif - Binary Image Format b&w graphics (Image Capture board)

.bin - binary file

.bio - OS2 BIOS

.bit - bitmap X11

.bm - BitMap graphics

.bmk - Help Bookmarks (Windows 3.x)

.bmp - BitMaP graphics (PC Paintbrush - many)

.bpt - bitmap fills file (CorelDRAW)

.btm - Batch To Memory batch file (4DOS)

.bup - backup file

.c - C source code file

.c - compressed unix file archive created by COMPACT

.c++ - C++ source code file

.cal - calendar file (Windows 3.x)

.cal - spreatsheet (SuperCalc)

.cbl - COBOL source code file

.cbm - compiled bitmap graphics (XLib)

.cbt - Computer Based Training (many)

.cc - C++ source code file

.ceg - bitmap graphics (Tempra Show - Edsun Continuous Edge Graphics)

.cga - CGA display font (Ventura Publisher)

.chk - recovered data (DOS CHKDSK)

.chk - temporary file (WordPerfect for Win)

.clp - clip art graphics (Quattro Pro)

.clp - clipboard file (Windows 3.x)

.cls - C++ class definition file

.cmd - batch file (OS/2)

.cmd - command (dBASE - Waffle)

.cmd - external command menu (1st Reader)

.cpp - C++ source code file

.cpp - presentation (CA-Cricket Presents)

.cpt - compressed Mac file archive created by COMPACT PRO (ext-pc.zip)

.cur - cursor image file (Windows 3.x)

.dat - data file in special format or ASCII

.dbd - debug info (Clarion Modula-2)

.dbg - symbolic debugging information (MS C/C++)

.dcf - disk image file

.dd - compressed Macintosh file archive created by DISKDOUBLER

.deb - DEBUG script (DOS Debug)

.def - defaults - definitions

.dem - demonstration

.dem - graphics (VistaPro)

.dgs - diagnostics

.dic - dictionary

.dir - directory file (VAX)

.diz - description file (Description In Zip)

.dlg - dialog resource script file (MS Windows SDK)

.dll - Dynamic Link Library (Windows 3.x - OS/2)

.dll - export/import filter (CorelDRAW)

.dmp - dump file (eg. screen or memory)

.doc - document text file

.dos - network driver (eg. pkt_dis.dos)

.dos - text file containing DOS specific info

.drv - device driver eg. for printer

.dsk - project desktop file (Borland C++ - Turbo Pascal)

.dss - screensaver file (DCC)

.ega - EGA display font (Ventura Publisher)

.emu - terminal emulation data (BITCOM)

.env - Enveloper macro (WOPR)

.env - environment file (WordPerfect for Win)

.err - error log

.err - error messages for command line compilers

.esh - Extended Shell batch file

.exc - REXX source code file (VM/CMS)

.exc - exclude file for Optimize (do not process) (QEMM)

.exe - directly executable program (DOS)

.exm - MSDOS executable, system-manager compliant (HP calculator)

.ext - extension file (Norton Commander)

.fac - FACE graphics

.faq - Frequently Asked Questions text file

.fax - fax (raster graphics) (most Fax programs)

.fdw - form (F3 Design and Mapping)

.fix - patch file

.frm - form (Visual Basic)

.ftp - configuration (FTP Software PC/TCP)

.fx - on-line guide (FastLynx)

.fxd - phonebook (FAXit)

.gbl - global definitions (VAXTPU editor)

.gfb - compressed GIF image created by GIFBLAST (gifblast.exe)

.gft - font (NeoPaint)

.gif - Graphics Interchange Format bitmap graphics (CompuShow)

.gly - glossary (MS Word)

.gph - graph (Lotus 1-2-3/G)

.gr2 - screen driver (Windows 3.x)

.grb - MS-DOS Shell Monitor file (MS-DOS 5)

.grp - group file (Windows 3.x - Papyrus)

.hlp - help information

.hof - Hall Of Fame (game scores)

.hp8 - ASCII text HP Roman8 character set (NewWave Write)

.htm - HTML document (Mosaic)

.htx - Hypertext file

.iax - bitmap graphics (IBM Image Access eXecutive)

.ibm - compressed file archive created by ARCHDOS (Internal IBM only)

.icn - ICON source code file

.ico - icon (Windows 3.x)

.id - disk identification file

.ifs - system file (OS/2) hpfs.ifs

.img - bitmap graphics (Ventura Publisher - GEM Paint)

.inc - include file (several programming languages)

.inf - information text file (ASCII)

.inf - install script

.ini - initialization file

.ins - (WordPerfect) wp51.ins

.ins - installation script (1st Reader)

.jas - graphics

.jbd - datafile (SigmaScan)

.jpc - graphics (Japan PIC)

.jpg - JPEG Joint Photography Experts Group format bitmap graphics

.jtf - graphics (TIFF file with JPEG compression)

.key - security file eg. Shareware Registration info

.kps - IBM KIPS bitmap graphics

.kyb - keyboard mapping (FTP Software PC/TCP)

.lbm - bitmap graphics (DeluxePaint)

.lbm - linear bitmap graphics (XLib)

.lcl - (FTP Software PC/TCP)

.ldb - (MS Access)

.lgo - startup logo code (Windows 3.x)

.lib - library file (several programming languages)

.lis - listing (VAX)

.log - log file

.lpc - printer driver (TEKO)

.m3d - 3D animation macro

.mac - bitmap graphics (Macintosh MacPaint)

.mac - macro

.mai - mail (VAX)

.mak - makefile

.mak - project file (Visual Basic)

.man - command manual

.map - color palette

.map - format data (Micrografx Picture Publisher)

.map - linker map file

.map - map (Atlas MapMaker)

.map - network map (AccView)

.mbx - mailbox data (ZERBERUS)

.mci - MCI command script (Media Control Interface)

.mcp - printer driver (Mathcad)

.mcw - text file (MacWrite II)

.mdm - modem definition (TELIX)

.meu - menu group (DOS Shell)

.mid - standard MIDI file (music synthetizers)

.mke - makefile (MS Windows SDK)

.mod - MODULA-2 source code file (Clarion Modula-2)

.mod - Windows kernel module

.mon - monitor description (ReadMail)

.mov - movie (AutoCAD AutoFlix)

.mp2 - MPEG audio file (xing)

.mpc - calender file (MS Project)

.mpg - MPEG animation

.msg - message

.msp - bitmap graphics (Microsoft Paint)

.mst - setup script (MS Windows SDK)

.mth - math file (Derive)

.mtm - MultiTracker Module music

.mtw - datafile (Minitab)

.mu - menu (Quattro Pro)

.mus - sound file (MusicTime)

.mvf - stop frame file (AutoCAD AutoFlix)

.mvi - movie command file (AutoCAD AutoFlix)

.mvw - log file (Saber LAN)

.mxt - (MS C)

.nws - info text file (latest news) (ASCII)

.nxt - sound (NeXT format)

.obj - object code (Intel Recolatable Object Module)

.ocx - OLE custom control

.off - Object File Format vector graphics

.old - backup file

.ovl - overlay file (part of program to be loaded when needed)

.ovr - overlay file (part of program to be loaded when needed)

.pac - STAD Image (graphics ?)

.pac - package (SBStudio II)

.pal - color palette

.par - permanent output file (Windows 3.x)

.pcc - cutout picture vector graphics (PC Paintbrush)

.pch - patch file

.pct - bitmap graphics (Macintosh b&w PICT1 - color PICT2)

.pcw - text file (PC Write)

.pcx - bitmap graphics (PC Paintbrush)

.pda - bitmap graphics

.pdv - printer driver (Paintbrush)

.pgm - Portable Grayscale bitMap graphics

.pgm - program (Signature)

.pgp - support file (Pretty Good Privacy RSA System)

.pgs - manual page (man4dos)

.pic - PIXAR picture file (SDSC Image Tool)

.pic - bitmap graphics (Macintosh b&w PICT1 - color PICT2)

.pic - bitmap graphics (many eg. Lotus 1-2-3 - PC Paint)

.pif - Program Information File (Windows 3.x)

.pif - vector graphics GDF format (IBM mainframe computers)

.pit - compressed Mac file archive created by PACKIT (unpackit.zoo)

.pll - pre-linked library (Clipper 5)

.pnt - Macintosh painting

.pop - messages index (PopMail)

.pop - pop-up menu object (dBASE Application Generator)

.prd - printer driver (many)

.pub - public key ring file (Pretty Good Privacy RSA System)

.qpr - print queue device driver (OS/2)

.qpx - compiled query program (FoxPro)

.qrt - QRT ray tracing graphics

.qry - query (dBASE IV)

.qt - QuickTime movie (animation)

.qwk - QWK reader message file

.qxd - document (QuarkXPress)

.qxl - element library (QuarkXPress)

.rdi - device-independent bitmap file (RIFF RDIB format)

.rdx - datafile (Reflex)

.rec - datafile (EpiInfo)

.rec - record file (Sprint)

.rec - recorded macro file (Windows 3.x)

.red - path info (Clarion Modula-2)

.ref - cross-reference

.reg - OLE Registration (Windows 3.x)

.reg - registration (Corel programs)

.rem - remarks

.rgb - SGI RGB image file (SDSC Image Tool)

.rif - RIFF bitmap graphics (Fractal Design Painter)

.rip - graphics (Remote Access)

.rix - bitmap graphics (ColorRIX VGA Paint)

.rmk - makefile (RMAKE)

.rpt - report

.rtf - Windows Help file script

.rtl - text file

.sav - backup file (saved file)

.sav - configuration

.sav - saved game situation (eg. NetHack)

.sbd - storyboard (Storyboard Editor)

.sbi - Sound Blaster Instrument file (Creative Labs)

.sbr - support file (Source Browser)

.scc - text file

.scr - DEBUG source code file (DOS Debug)

.scr - screen saver (Windows 3.x)

.scx - bitmap graphics (ColorRIX)

.sea - Self-Extracting compressed Macintosh file Archive

.sec - secret key ring file (Pretty Good Privacy RSA System)

.sec - secured animation file (Disney Animation Studio)

.set - setup options file

.sgi - graphics (IRIS - Silicon Graphics)

.sig - current program settings (Signature)

.sig - signature file (PopMail)

.sit - compressed Macintosh archive created by STUFFIT (unsit30.zip)

.smp - sample (sound file)

.smt - text file (Smart Ware II)

.snd - digitized sound file (Macintosh/ATARI/PC)

.spl - sample

.sum - Summary

.swp - swap file (DOS)

.sys - datafile (SYGRAPH - SYSTAT - SPSS/PC)

.sys - system file - device driver or hardware configuration info (DOS)

.tbl - graphics (native format) (PageMaker TableEditor)

.tbl - table of values (OS/2)

.tel - host file (Telnet)

.tga - TrueVision Targa bitmap graphics

.tmp - temporary file

.toc - Table Of Contents

.tre - directory tree file (PC-Tools)

.trm - terminal settings (Windows 3.x)

.tut - tutorial

.ub - audio file (unsigned byte)

.uhs - Universal Hint System (binary file)

.uif - long prompts for windows (WordPerfect for Win)

.unx - text file containing UNIX specific info

.upd - program update info

.usr - user database file (Procomm Plus - Turbo C++ tour)

.vbx - Visual Basic eXtension (Visual Basic)

.vga - VGA display driver

.vga - VGA display font

.vgd - VGA display driver (Generic CADD)

.vid - MS-DOS Shell Monitor file (MS-DOS 5)

.vid - bitmap graphics (YUV12C M-Motion Frame Buffer)

.vid - screen device driver (Word)

.voc - digitized samples (Creative Voice file)

.vst - Truevision Vista bitmap graphics

.vue - animation (3D Studio)

.vxd - Windows 3.x virtual device driver (QEMM)

.w31 - startup file (Windows 3.1)

.wav - Waveform audio file (RIFF WAVE format)

.wbf - MS Windows Batch File (Catch)

.wbt - batch file (WinBatch)

.web - WEB source code file

.woa - swap file (Windows 3.x)

.wrs - Windows Resource eg. printer driver (WordPerfect for Win)

.xbm - X11 Bitmap graphics

.xll - Excel Dynamic Link Library (MS Excel)

.xmi - compressed eXtended MIdi music

.xwd - X Window System window dump image graphics (SDSC Image Tool)

.xx - compressed file ASCII archive created by XXENCODE (uuexe515.exe)

.xxe - compressed file ASCII archive created by XXENCODE (uuexe515.exe)

.zip - compressed file archive created by PKZIP (pkz204g.exe)

.zoo - compressed file archive created by ZOO (zoo210.exe)

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