.$$$	temporary file
.$db	temporary file (dBASE IV)
.$ed	----- temporary file (MS C) editor
.$vm	----- temporary file (Windows 3) virtual manager
.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	roff/nroff/troff/groff source for manual page (cawf2.zip)
.15u	printer font with PI font set (PageMaker)
.1st	usually README.1ST ASCII text file
.301	FAX Data file (Super FAX 2000)
.386	Intel 80386 processor specific file (Windows 3)
.3ds	graphics file (3D Studio)
.3fx	effect (CorelChart)
.3gr	----- data file (Windows Video Grabber)
.4c$	datafile (4Cast/2)
.4sw	4DOS Swap File
.4th	FORTH source code file (ForthCMP)
.8	A86 assembler source code file
.8m	printer font with Math 8 extended character set (PageMaker)
.8u	printer font with Roman 8 extended character set (PageMaker)
.a	ADA source code file
.a	library (unix)
.a11	graphics AIIM image file
.ab6	datafile (ABStat)
.ab8	datafile (ABStat)
.abk	automatic backup file (CorelDRAW)
.abs	abstracts (info file)
.acc	----- (DR-DOS - ViewMax) programm (GEM / resident)
.act	ACTOR source code file
.act	FoxDoc Action Diagrams (FoxPro)
.ad	screen saver data (After Dark)
.ada	ADA source code file
.adb	Ada Package Body
.adi	graphics file (AutoCAD)
.adl	MCA adapter description library (QEMM)
.adn	add-in (Lotus 1-2-3)
.ads	Ada Package Specification
.adt	datafile for cardfile application (HP NewWave)
.afl	font file (for Allways) (Lotus 1-2-3)
.afm	datafile for cardfile application (HP NewWave)
.afm	outline font description (Adobe Type 1 PostScript font)
.ai	vector graphics file (Adobe Illustrator)
.aio	APL file transfer format file
.ais	Array of Intensity Samples graphics file (Xerox)
.aix	datafile for cardfile application (HP NewWave)
.all	----- (Arts & Letters) symbol and font files
.all	general printer information (WordPerfect for Win)
.all	format file for working pages (Always)
.alt	menu file (WordPerfect Library)
.ani	animate file (IconAuthor)
.anm	animation file (Deluxe Paint Animator)
.ann	Help Annotations (MS Windows)
.ans	ASCII text ANSI character set (NewWave Write)
.ap	compressed Amiga file archive created by WHAP
.ap	datafile (Datalex EntryPoint 90)
.apc	----- (Lotus 1-2-3) printer driver
.apd	----- (Lotus 1-2-3) printer driver
.apf	----- (Lotus 1-2-3) printer driver
.api	----- (Lotus 1-2-3) printer driver
.apl	APL work space format file
.app	add-in application file (Symphony)
.app	application object file (dBASE Application Generator)
.app	executable application file (DR-DOS - NeXTstep)
.app	generated application (FoxPro)
.arc	compressed file archive created by ARC (arc602.exe/pk361.exe)
.arc	compressed file archive created by SQUASH (squash.arc)
.arj	compressed file archive created by ARJ (arj241.exe)
.ark	ARC file created by CP/M port of ARC file archiver
.art	graphics file (scrapbook) (Art Import)
.art	raster graphic file (Atari)
.asc	ASCII text file
.asd	----- (Lotus 1-2-3) screen driver
.asd	autosave file (Word for Windows)
.asf	----- (Lotus 1-2-3) screen font
.asf	datafile (STATGRAPHICS)
.ash	assembly language header file (TASM 3.0)
.asi	assembler include file (Turbo C - Borland C++)
.asm	ASSEMBLY source code file
.aso	assembler object (object orientated) file (Turbo Assembler)
.asp	ASPECT source code file (Procomm Plus)
.asp	Association of Shareware Professionals OMBUDSMN.ASP notice
.at2	auto template (Aldus Persuasion 2.0)
.au	audio file (SUN Microsystems)
.aux	Auxillary references (TeX/LaTeX)
.aux	auxiliary dictionary (ChiWriter)
.avi	Audio Video Interleaved animation file (Video for Windows)
.aw	text file (HP AdvanceWrite)
.awk	AWK script/program
.aws	----- (STATGRAPHICS)
.b	batch list (APPLAUSE)
.b&w	black and white graphics file
.b30	printer font (JLaser - Cordata) (Ventura Publisher)
.b8	raw graphics file (one byte per pixel) plane two
.bak	backup file
.bar	horizontal bar menu object file (dBASE Application Generator)
.bas	BASIC source code file
.bat	batch file (DOS)
.bb	database backup (Papyrus)
.bbl	Bibliographic reference file (TeX/BibTeX)
.bbs	Bulletin Board System announce or text info file
.bch	batch process object file (dBASE Application Generator)
.bch	datafile (Datalex EntryPoint 90)
.bco	outline font description (Bitstream)
.bdf	Bitmap Distribution Format font file (X11)
.bdf	datafile (Egret)
.bez	outline font description (Bitstream)
.bf2	Bradford 2 font
.bfm	font metrics (unix/Frame)
.bgi	Borland Graphics Interface device driver (Turbo C - Turbo Pascal)
.bib	bibliography (ASCII)
.bib	database - not compatible with TeX format (Papyrus)
.bib	literature database (TeX/BibTeX)
.bif	Binary Image Format b&w graphics file (Image Capture board)
.bin	binary file
.bio	OS2 BIOS
.bit	bitmap X11
.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)
.bkw	mirror image of font set (FontEdit)
.bld	BASIC file in BLOAD format
.blk	temporary file (WordPerfect for Win)
.bm	BitMap graphics file
.bmk	Help Bookmarks (MS Windows)
.bmp	BitMaP graphics file (Windows 3) (PC Paintbrush)
.bnk	Adlib instrument bank file
.boo	compressed file ASCII archive created by BOO (msbooasm.arc)
.bpt	bitmap fills file (CorelDRAW)
.brd	Eagle Layout File (?)
.bsc	database (Source Browser)
.bsc	pwbrmake object file (MS Fortran)
.btm	Batch To Memory batch file (4DOS)
.bup	backup file
.buy	datafile format (movie)
.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)
.c	C source code file
.c	compressed unix file archive created by COMPACT
.c00	print file (Ventura Publisher)
.c86	C source code file for Computer Innovation's C86 C compiler
.cac	dBASE IV executable when caching on/off (see cachedb.bat)
.cal	calendar file (MS Windows)
.cal	spreatsheet (SuperCalc)
.cap	caption (Ventura Publisher)
.cap	session capture file (Telix)
.cat	catalog (dBASE IV)
.cbl	COBOL source code file
.cbt	Computer Based Training (many)
.cc	C++ source code file
.ccf	communications configuration file (Symphony)
.cch	chart (CorelChart)
.cco	BTX Graphics file (XBTX)
.cdb	main database (TCU Turbo C Utilities)
.cdr	vector graphics file (CorelDRAW native format)
.cdx	compound index (FoxPro)
.cel	graphics file (Autodesk Animator)
.cf	configuration file (imake)
.cfg	configuration file
.cfo	C Form Object internal format object file (TCU Turbo C Utilities)
.cga	CGA display font (Ventura Publisher)
.cgm	Computer Graphics Metafile vector graphics (A&L - HG...)
.ch	header file (Clipper 5)
.ch3	chart file (Harward Graphics 3.0)
.chi	document (ChiWriter)
.chk	recovered data file by CHKDSK (DOS)
.chk	temporary file (WordPerfect for Win)
.chn	----- (Ethnograph 3)
.chp	chapter file (Ventura Publisher)
.chr	character set file (Turbo C - Turbo Pascal)
.cht	chart file (Harward Graphics 2.0)
.cht	interface file for ChartMaster (dBASE)
.cif	Caltech Intermediate Format graphics file
.cif	chapter information (Ventura Publisher)
.cix	database index file (TCU Turbo C Utilities)
.cl	COMMON LISP source code file
.clp	clip art graphics file (Quattro Pro)
.clp	clipboard file (MS Windows)
.clp	compiler script file (clip list) (Clipper 5)
.cls	C++ class definition file
.cmd	batch file (OS/2)
.cmd	command file (dBASE)
.cmf	Creative Music File sound file (Soundblaster command file)
.cmm	CMM source code (batch) file (CEnvi)
.cmp	header file for PostScript printer files (CorelDRAW)
.cmp	user dictionary (MS Word for DOS)
.cnc	CNC general program data
.cnf	configuration (program - printer setup)
.cnv	data conversion support file (Word for Windows)
.cnv	temporary file (WordPerfect for Win)
.cob	COBOL source code file
.cod	datafile (Forecast Plus - MS Multiplan - StatPac Gold)
.cod	program compiled code (FORTRAN)
.cod	template source file (dBASE Application Generator)
.col	color palette (Autodesk Animator)
.col	spreadsheet (MS Multiplan)
.com	command (memory image of executable program) (DOS)
.cpi	Code Page Information file (DOS)
.cpi	ColorLab Processed Image bitmapped graphics file
.cpl	control panel file (MS Windows 3.1)
.cpp	C++ source code file
.cps	----- backup of startup files by QEMM (?) autoexec.cps
.cpt	compressed Mac file archive created by COMPACT PRO (ext-pc.zip)
.cpt	encrypted memo file (dBASE)
.crd	cardfile (MS Windows)
.crf	cross-reference (MS MASM - Zortech C++)
.crp	encrypted database (dBASE IV)
.crs	file conversion support file (WordPerfect 5.1)
.csp	PC Emcee Screen Image file (Computer Support Corporation)
.css	datafile (CSS - Stats+)
.csv	Comma Separated Values text file format (ASCII)
.csv	adjusted EGA/VGA palette (CompuShow)
.ctc	control file (PC Installer)
.ctf	character code translation file (Symphony)
.ctl	control file (dBASE IV - Aldus Setup)
.ctx	Course TeXt file (some Microsoft online guides)
.ctx	ciphertext file (Pretty Good Privacy RSA System)
.cuf	C Utilities Form definition (TCU Turbo C Utilities)
.cur	cursor image file (Windows3)
.cut	bitmap graphics file (Halo)
.cv4	color file (CodeView)
.cvt	backup file for CONVERTed database file (dBASE IV)
.cvw	color file (CodeView)
.cxx	C++ source code file (Zortech C++)
.dat	data file in special format or ASCII
.db	configuration file (dBASE IV - dBFast)
.db	database file (Paradox - Smartware)
.db$	temperature debug info (Clarion Modula-2)
.db2	database file (dBASE II)
.db3	database file (dBASE III)
.dba	datafile (DataEase)
.dbd	debug info (Clarion Modula-2)
.dbf	database file (dBASE III/IV - FoxPro - dBFast)
.dbg	symbolic debugging information (MS C/C++)
.dbk	database backup (dBASE IV)
.dbm	datafile (DataEase)
.dbo	compiled program (dBASE IV)
.dbs	datafile (PRODAS)
.dbs	database in SQL Windows format
.dbs	printer description file (Word - Works)
.dbt	FoxBASE+ style memo (FoxPro)
.dbt	memo file for database w/same name (dBASE IV - dBFast)
.dca	Document Content Architecture text file (IBM DisplayWrite)
.dcp	Data CodePage (OS/2)
.dcs	datafile (ACT! Activity Files)
.dct	spell checking dictionary (Harward Graphics 3.0 - Symphony)
.dcx	multi-page PCX graphics (commonly used by fax programs)
.dd	compressed Macintosh file archive created by DISKDOUBLER
.ddi	DiskDupe Image file (ddupe322.zip)
.ddp	Device Driver Profile file (OS/2)
.def	defaults - definitions
.dem	demonstration
.dev	device driver
.dfd	Data Flow Diagram graphic file (Prosa)
.dfi	outline font description (Digifont)
.dfm	Data Flow Diagram model file (Prosa)
.dfv	printing form (Word)
.dgn	graphics file (MicroStation)
.dhp	Dr. Halo PIC Format graphics file (Dr. Halo II - III)
.dht	datafile (Gauss)
.dia	Diagraph graphics file (Computer Support Corporation)
.dib	Device-Independent Bitmap graphics file (MS Windows)
.dic	dictionary
.dif	database (VisiCalc)
.dif	text file (Data Interchange Format)
.dir	dialing directory file (Procomm Plus)
.dis	thesaurus (CorelDraw)
.diz	description file
.dl	animation file (Italian origin)
.dld	----- (Lotus 1-2-3)
.dlg	dialog resource script file (MS Windows SDK)
.dll	Dynamic Link Library (Windows - OS/2)
.dll	export/import filter (CorelDRAW)
.dmo	----- demo - (Derive)
.dmp	dump file (eg. screen or memory)
.dms	compressed Amiga file archive created by DISKMASHER
.doc	document text file
.dog	screen file (Laughing Dog Screen Maker)
.dos	text file containing DOS specific info
.dot	line-type definition file (CorelDRAW)
.dot	template (Word for Windows)
.dox	text file (MultiMate 4.0)
.dpr	default project- and state-related information (Borland C++)
.drs	Display Resource (WordPerfect for Win)
.drv	device driver eg. for printer
.drw	vector graphics file (Micrografx Designer)
.dsk	project desktop file (Borland C++)
.dsp	graphics display driver (Dr.Halo)
.dsr	driver resource (WordPerfect for Win)
.dt_	data fork of a Macintosh file (Mac-ette)
.dta	data file (Turbo Pascal - PC-File - Stata)
.dtf	database file (PFS - Q&A)
.dvc	----- (Lotus 1-2-3)
.dvi	DeVice Independent document (TeX)
.dvp	DESQview Program Information file (DESQview)
.dvp	device parameter file (AutoCAD)
.dwc	compressed file archive created by DWC (dwc-a501.exe)
.dwg	drawing database (AutoCAD)
.dx	text file (DEC WPS/DX format - DEC WPS Plus)
.dxf	Drawing Interchange File Format vector graphics (AutoCAD)
.dyn	----- (Lotus 1-2-3)
.eeb	button bar for Equation Editor (WordPerfect for Win)
.eft	high resolution screen font (ChiWriter)
.ega	EGA display font (Ventura Publisher)
.el	ELISP source code file (emacs functions)
.elt	event list text file (Prosa)
.enc	encoded file - UUENCODEd file (Lotus 1-2-3 - uuexe515.exe)
.end	arrow-head definition file (CorelDRAW)
.eng	dictionary engine (Sprint)
.eng	graphics file (charting) (EnerGraphics)
.env	environment file (WordPerfect for Win)
.eps	Encapsulated PostScript vector graphics (Adobe Illustrator)
.eps	printer font (Epson - Xerox...) (Ventura Publisher)
.eqn	equation file (WordPerfect for Win)
.erd	Entity Relationship Diagram graphic file (Prosa)
.erm	Entity Relationship Diagram model file (Prosa)
.err	error log
.esh	Extended Shell batch file
.eth	document (Ethnograph 3)
.etx	structure-enhanced text for some ascii text browsers
.ex3	device driver (Harward Graphics 3.0)
.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)
.f	FORTRAN source code file
.f	compressed file archive created by FREEZE
.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)
.f77	FORTRAN 77 source code file
.fac	Usenix FACE graphics file
.faq	Frequently Asked Questions text file
.fax	fax graphics image (WinFax Pro)
.fc	spell checking dictionary (Harward Graphics 2.0)
.fd	declaration file (MS Fortran)
.fd	field offsets for compiler (DataFlex)
.feb	button bar for Figure Editor (WordPerfect for Win)
.ff	outline font description (Agfa Compugraphics)
.fft	DCA/FFT Final Form Text text file (DisplayWrite)
.fi	interface file (MS Fortran)
.fif	Fractal Image Format file
.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)
.fit	FITS graphics file
.fky	macro file (FoxPro)
.flb	format library (Papyrus)
.fld	folder (Charisma)
.fli	animation file (Autodesk Animator)
.flm	Film Roll (AutoCAD/AutoShade)
.flt	support file (Asymetrix ToolBook) - graphics filter
.flt	filter file (Micrografx Picture Publisher)
.flx	compiled binary (DataFlex)
.fm1	spreadsheet (Lotus 1-2-3 release 2.x)
.fm3	device driver (Harward Graphics 3.0)
.fm3	spreadsheet (Lotus 1-2-3 release 3.x)
.fmb	File Manager Button bar (WordPerfect for Win)
.fmo	compiled format file (dBASE IV)
.fmt	format file (dBASE IV - FoxPro - Clipper 5 - dBFast)
.fmt	style sheet (Sprint)
.fn3	font file (Harward Graphics 3.0)
.fnt	font file (many)
.fnx	inactive font (Exact)
.fo1	font file (Borland Turbo C)
.fo2	font file (Borland Turbo C)
.fon	dialing directory file (Telix)
.fon	font file (many - Windows3 font library)
.fon	log of all calls (Procomm Plus)
.for	FORTRAN source code file (MS Fortran)
.fot	TrueType font file (MS Windows 3.1)
.fp	configuration file (FoxPro)
.fpt	memo (FoxPro)
.fr3	renamed dBASE III+ form file (dBASE IV)
.frg	uncompiled report file (dBASE IV)
.frm	form (Visual Basic)
.frm	report file (dBASE IV - Clipper 5 - dBFast)
.frm	text form
.fro	compiled report file (dBASE IV)
.frs	screen font resource file (WordPerfect for Win)
.frt	report memo (FoxPro)
.frx	report (FoxPro)
.fst	linkable program (dBFast)
.fsx	----- (Lotus 1-2-3)
.ftm	font file (Micrografx)
.ftp	configuration file (FTP Software PC/TCP)
.fw	database (FrameWork)
.fw2	database (Framework II)
.fw3	database (Framework III)
.fx	on-line guide (FastLynx)
.fxp	compiled format (FoxPro)
.fxs	Winfax Transmit Format graphics file (WinFax)
.g	data chart file (APPLAUSE)
.g8	raw graphics file (one byte per pixel) plane three
.gdf	dictionary file (GEOS)
.ged	EDITOR's native file format (Arts & Letters)
.ged	graphics editor file (EnerGraphics)
.gem	vector graphics file (GEM - Ventura Publisher)
.gen	compiled template (dBASE Application Generator)
.gen	generated text (Ventura Publisher)
.geo	GEOS specific file (application) (GeoWorks)
.gfb	compressed GIF image created by GIFBLAST (gifblast.exe)
.gif	Graphics Interchange Format bitmap graphics file (CompuShow)
.gl	animation file (GRASP GRAphical System for Presentation)
.glm	datafile (Glim)
.gls	datafile (Across)
.gly	glossary (MS Word)
.gmf	CGM graphics file (APPLAUSE)
.gr2	screen driver (Windows 3)
.gra	datafile (SigmaPlot)
.grb	MS-DOS Shell Monitor file (MS-DOS 5)
.grf	graph file (Graph Plus - Charisma)
.grp	group file (MS Windows - Papyrus)
.gz	compressed file archive created by GZIP (GNU zip)
.h	header file
.ha	compressed file archive created by HA (ha098.zip)
.hbk	handbook (Mathcad)
.hdf	Hierarchical Data File graphics file (SDSC Image Tools)
.hdl	alternate download file listing (Procomm Plus)
.hdr	PC-File+ Database header
.hdr	datafile (Egret)
.hdr	header for messages (mail) left by remote users (Procomm Plus)
.hdx	help index (AutoCAD - Zortech C++)
.hex	hex dump
.hfi	HP Font Info file (GEM)
.hgl	HP Graphics Language graphics file
.hh	C++ header file
.hhh	precompiled header file (Power C)
.hhp	help information for remote users (Procomm Plus)
.hlp	help information
.hmm	alternate Mail Read option menu (Procomm Plus)
.hnc	CNC program files Heinenhain dialog
.hof	Hall Of Fame (game scores)
.hp8	ASCII text HP Roman8 character set (NewWave Write)
.hpf	HP LaserJet fonts (PageMaker)
.hpg	HPGL plotter file vector graphics (AutoCad - Harward Graphics)
.hpi	font information file (GEM)
.hpk	compressed file archive created by HPACK (hpack75.zip)
.hpm	EMM text (HP NewWave)
.hpm	alternate Main menu for privileged users (Procomm Plus)
.hpp	C++ header file (Zortech C++)
.hqx	compressed Macintosh ASCII archive created by BINHEX (xbin23.zip)
.hrm	alternate Main menu for limited/normal users (Procomm Plus)
.hsi	Handmade Software Inc. graphics file almost JPEG (Image Alchemy)
.hst	history file (Procomm Plus)
.htx	Hypertext file
.hxm	alternate Protocol Selection menu for all users (Procomm Plus)
.hxx	C++ header file
.hy1	hyphenation algorithms (Ventura Publisher)
.hy2	hyphenation algorithms (Ventura Publisher)
.hyc	----- (WordPerfect)
.hyd	hyphenation dictionary (WordPerfect for Win)
.hyp	compressed file archive created by HYPER (hyper25.zip)
.ibm	compressed file archive created by ARCHDOS (Internal IBM only)
.icn	ICON source code file
.ico	icon (Windows3)
.id	disk identification file
.idx	index (many - FoxPro)
.iff	Interchangeable File Format bitmap graphics/sound file (Amiga)
.iff	Sun TAAC Image File Format (SDSC Image Tool)
.ifs	system file (OS/2) hpfs.ifs
.im8	Sun raster graphics file
.ima	Mirage vector graphics (EGO, Chart, Autumn)
.img	bitmap graphics file (Ventura Publisher - GEM Paint)
.in$	installation file (HP NewWave)
.in3	input device driver (Harward Graphics 3.0)
.inc	include file (several programming languages)
.ind	----- index (dBASE IV)
.inf	information text file (ASCII)
.inf	setup installation support file (MS Windows SDK)
.ini	initialization file
.ink	Pantone reference fills file (CorelDRAW)
.ins	----- (WordPerfect) wp51.ins
.int	Borland Interface Units
.inx	index (Foxbase)
.io	compressed file archive created by CPIO
.ion	file info file (4DOS descriot.ion file)
.ipl	Pantone Spot reference palette file (CorelDRAW)
.irs	----- (WordPerfect) standard.irs
.isd	Spelling Checker dictionary (RapidFile)
.ish	compressed file archive created by ISH
.iw	iconware application (IconAuthor)
.iwa	text file (IBM Writing Assistant)
.iwp	text file (Wang)
.jas	----- graphics file
.jbd	datafile (SigmaScan)
.jbx	project file (Project Scheduler 4)
.jor	journal file SQL
.jpg	graphics file JPEG Joint Photography Experts Group format
.jw	text file (JustWrite)
.jwl	text file (JustWrite Library)
.jzz	spreatsheet (Jazz)
.kbd	terminal emulation keyboard mapping (Procomm Plus)
.kbm	keyboard mapping (Reflection 4)
.kex	KEDIT profile file
.key	datafile (Forecast Pro)
.key	keyboard macros
.kyb	keyboard mapping (FTP Software PC/TCP)
.l	LEX source code file
.l	LISP source code file
.l	linker directive file (WATCOM wlink)
.lab	datafile (NCSS - SOLO)
.lab	mailing labels (Q+E for MS Excel)
.lay	word chart layout (APPLAUSE)
.lbg	label generator data (dBASE IV)
.lbl	label (dBASE IV - Clipper 5 - dBFast)
.lbm	bitmapped graphics file (Deluxe Paint/Amiga)
.lbo	compiled label (dBASE IV)
.lbr	compressed file archive created by LU (lue220.arc)
.lbr	display driver (Lotus 1-2-3)
.lbt	label memo (FoxPro)
.lbx	label (FoxPro)
.lcf	Linker Control File (Norton Guides compiler)
.lcl	----- (FTP Software PC/TCP)
.lcn	----- (WordPerfect) wp{wp}su.lcn dictionary support file
.lcs	datafile (ACT! History Files)
.ld	Long Distance codes file (Telix)
.ld1	overlay file (dBASE)
.les	lesson (check *.cbt)
.lev	level file (NetHack 3.x)
.lex	lexicon (dictionary) (many)
.lft	laser printer font (ChiWriter)
.lg	Logo procedure definitions (LSRHS Logo)
.lgo	startup logo code (MS Windows)
.lha	compressed file archive created by ? (lha213.exe)
.lhw	compressed Amiga file archive created by LHWARP
.lib	library file (several programming languages)
.lif	compressed file archive
.lif	Logical Interchange Format data file (Hewlett-Packard)
.lin	line types (AutoCAD)
.lj	text file for HP LJ II printer
.ll3	LapLink III related file (document) (LapLink III)
.lnk	linker response file (.RTLink)
.log	log file
.lpc	printer driver (TEKO)
.lrf	linker response file (MS C/C++)
.lrs	Language Resource File (WordPerfect for Win)
.lsp	LISP source code file (Xlisp)
.lst	list file (archive index - compiler listfile)
.lzd	difference file for binaries (Ldiff 1.20)
.lzh	compressed file archive created by LHA/LHARC (lha213.exe)
.lzs	compressed file archive created by LARC (larc333.zip)
.lzw	compressed Amiga file archive created by LHWARP
.m	function (program) (Matlab)
.m	standard package (Mathematica)
.m11	text file (MASS11)
.m3	MODULA 3 source code file
.m3d	3D animation macro
.m_u	backup of boot sector, FAT and boot dir (MazeGold)
.ma3	macro (Harward Graphics 3.0)
.mac	bitmap graphics file (Macintosh MacPaint)
.mac	macro
.mag	Woody Lynn's MAG graphics format (MPS Magro Paint System)
.mak	makefile
.mak	project file (Visual Basic)
.man	command manual
.map	color palette file
.map	format data (Micrografx Picture Publisher)
.map	linker map file
.mat	----- (Matlab)
.max	MAX source code file
.mb	memo field values for database (Paradox)
.mbk	multiple index file backup (dBASE IV)
.mcc	configuration file (MathCAD)
.mcd	document (MathCAD)
.mcf	font file (MathCAD)
.mcp	printer driver (MathCAD)
.mcw	text file (MacWrite II)
.md	compressed file archive created by MDCD (mdcd10.arc)
.mdb	database (MS Access)
.mdm	modem definition file (TELIX)
.mdx	multiple index file (dBASE IV)
.me	usually ASCII text file READ.ME
.meb	Macro Editor bottom overflow file (WordPerfect Library)
.med	Macro Editor delete save (WordPerfect Library)
.mem	memory variable save file (dBASE IV - FoxPro)
.mem	Macro Editor macro (WordPerfect Library)
.meq	Macro Editor print queue file (WordPerfect Library)
.mer	Macro Editor resident area (WordPerfect Library) (vakioalue)
.mes	Macro Editor work space file (WordPerfect Library)
.met	Macro Editor top overflow file (WordPerfect Library)
.meu	menu group (DOS Shell)
.mex	Macro Editor expound file (WordPerfect Library)
.mex	MEX file (executable command) (Matlab)
.mf	MetaFont text file
.mgf	font (Micrografx)
.mid	MIDI file (MS Windows)
.mii	datafile (MicroStat-II)
.mix	object file (Power C)
.mk	usually makefile
.mke	makefile (MS Windows SDK)
.mki	japanese graphics MAKIchan format (MagView 0.5)
.mks	----- (TACT)
.mlb	macro library file (Symphony)
.mm	text file (MultiMate Advantage II)
.mmo	memo writer file (RapidFile)
.mnd	menu source (AutoCAD Menu Compiler)
.mnt	menu memo (FoxPro)
.mnu	advanced macro file (HP NewWave)
.mnu	menu (AutoCAD Menu Compiler - Norton Commander)
.mnx	compiled menu file (AutoCAD)
.mnx	menu (FoxPro)
.mob	device definition file (PEN Windows)
.mod	MODULA-2 source code file (Clarion Modula-2)
.mod	Windows kernel module
.mod	sound file (Amiga)
.mov	movie file (AutoCAD AutoFlix)
.mpc	calender file (MS Project)
.mpg	MPEG animation file
.mpm	MathPlan macro (WordPerfect Library)
.mpp	project file (MS Project)
.mpr	generated program (FoxPro)
.mpv	view file (MS Project)
.mpx	compiled menu program (FoxPro)
.mrb	Multiple Resolution Bitmap graphics file (MS C/C++)
.mrs	macro resource file (WordPerfect for Win)
.msg	message text file (ASCII)
.msp	bitmap graphics file (MS Windows 2.x Paint)
.mss	manuscript text file (Perfect Writer - Scribble - MINCE - Jove)
.mst	Minispecification file (Prosa)
.mst	setup script file (MS Windows SDK)
.msw	text file (MS Word)
.mth	math file (Derive)
.mtw	datafile (Minitab)
.mu	menu (Quattro Pro)
.mus	sound file
.mvf	stop frame file (AutoCAD AutoFlix)
.mvi	movie command file (AutoCAD AutoFlix)
.mxt	----- (MS C)
.nap	naplps file (VideoShow) (EnerGraphics)
.nb	text file (Nota Bene)
.ncd	Norton Change Directory support file (Norton Commander)
.ndx	index file (dBASE II - III - IV - dBFast)
.neo	raster graphics file (Atari Neochrome)
.net	network configuration/info file (Harward Graphics Win - Paradox)
.new	new info
.ng	online documentation database (Norton Guide)
.npi	source for DGEN.EXE intepreter (dBASE Application Generator)
.nst	Amima MOD sound file
.nts	Tutorial (Norton)
.ntx	index file (Clipper 5)
.nuf	message for new users on their 1st call (Procomm Plus)
.nws	info text file (latest news) (ASCII)
.o	object file (unix)
.o$$	outfile (Sprint)
.obj	object (machine-language) code
.ocf	Object Craft File (Object Craft)
.off	Object File Format vector graphics file
.old	backup file
.oli	text file (Olivetti)
.oom	swap file (Shroom)
.opn	active options (Exact)
.opt	Optimize support file (QEMM)
.opx	inactive options (Exact)
.otl	outline font description (Z-Soft Type Foundry)
.otx	text file (Olivetti Olitext Plus)
.out	output file
.ov1	overlay file (part of program to be loaded when needed)
.ov2	overlay file (part of program to be loaded when needed)
.ovl	overlay file (part of program to be loaded when needed)
.ovr	overlay file (part of program to be loaded when needed)
.p	PASCAL source code file
.p	Rea-C-Time application parameter file (ReaGeniX code generator)
.p	picture file (APPLAUSE)
.p22	patch file (Patch22)
.pad	keypad definition (Telemate)
.pak	compressed file archive created by PAK (pak251.exe)
.pal	color palette file
.pan	printer-specific file (copy to coreldrw.ink) (CorelDRAW)
.par	parameter file (Fractint)
.par	permanent output file (Windows)
.pas	PASCAL source code file
.pat	hatch patterns (AutoCAD)
.pat	vector fill files (CorelDRAW)
.pbi	Profiler Binary Input (MS Source Profiler)
.pbm	PBM Portable Bit Map graphics file
.pbo	Profiler Binary Output (MS Source Profiler)
.pbt	Profiler Binary Table (MS Source Profiler)
.pc	text file containing IBM PC specific info
.pc3	custom palette file (Harward Graphics 3.0)
.pc8	ASCII text IBM8 character set (NewWave Write)
.pcc	cutout picture vector graphics (PC Paintbrush)
.pcd	Photo-CD Image graphics file (hpcdtoppm)
.pcf	Profiler Command File (MS Source Profiler)
.pch	patch file
.pch	precompiled header (MS C/C++)
.pcj	multimedia authoring tool graphics file (IBM's Linkaway-Live)
.pck	pick file (Turbo Pascal)
.pcl	HP-PCL graphics data file (HP Printer Control Language)
.pct	bitmap graphics file (Macintosh b&w PICT1 - color PICT2)
.pcw	text file (PC Write)
.pcx	bitmapped graphics (PC Paintbrush)
.pdb	----- (TACT)
.pds	PDS graphics file
.pdv	printer driver (Paintbrush)
.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)
.pfa	outline font description (Readable PostScript)
.pfb	outline font description (Adobe Type 1 PostScript font)
.pfc	text file (First Choice)
.pfk	programmable function keys (XTreePro)
.pfm	Printer outline Font Metric file (Adobe Type 1 PostScript font)
.pfs	database (PFS:FILE) - text file (PFS:Write)
.pft	printer font (ChiWriter)
.pgi	Printer Graphics File device driver (PGRAPH library)
.pgm	PBM Portable Gray Map graphics file
.pgp	support file (Pretty Good Privacy RSA System)
.ph	PERL header file
.ph	phrase-table (MS C/C++)
.pic	PIXAR picture file (SDSC Image Tool)
.pic	bitmap graphics file (Macintosh b&w PICT1 - color PICT2)
.pic	bitmap graphics file (many eg. Lotus 1-2-3 - PC Paint)
.pif	Program Information File (Windows 3)
.pif	vector graphics GDF format file (IBM mainframe computers)
.pit	compressed Mac file archive created by PACKIT (unpackit.zoo)
.pix	Alias image file (SDSC Image Tool)
.pjt	project memo (FoxPro)
.pjx	project (FoxPro)
.pk	PacKed bitmap font bitmap file (TeX DVI drivers)
.pka	compressed file archive created by PKARC
.pl	----- (Harward Graphics Win) palette file
.pl	PERL source code file
.pl	Property List font metric file (TeX)
.pl3	chart palette file (Harward Graphics 3.0)
.plb	library (FoxPro)
.plc	add-in file (functions - macros - applications) (Lotus 1-2-3)
.pll	pre-linked library (Clipper 5)
.pln	spreadsheet (WordPerfect for Win)
.plt	HPGL plotter file vector graphics (AutoCAD)
.plt	pre-linked transfer file (Clipper 5)
.pm	PM graphics file
.pm3	document (PageMaker 3)
.pm4	document (PageMaker 4)
.pmm	program file (Amaris BTX/2)
.pn3	printer device driver (Harward Graphics 3.0)
.pnm	PBM Portable aNy Map graphics file
.pnt	Macintosh painting
.pop	pop-up menu object (dBASE Application Generator)
.pp	compressed Amiga file archive created by POWERPACKER
.ppb	button bar for Print Preview (WordPerfect for Win)
.ppl	PolaroidPalettePlus ColorKey device driver (Harward Graphics 3.0)
.ppm	PBM Portable Pixel Map graphics file
.ppo	pre-processor output (Clipper 5)
.ppt	general file extension (PowerPoint)
.pr2	presentation (Aldus Persuasion 2.0)
.pr2	printer driver (dBASE IV)
.pr3	PostScript printer driver (dBASE IV)
.prd	printer driver (many)
.pre	settings (Programmer's WorkBench - MS C/C++)
.prf	Pixel Run Format graphics file (Improces - Fastgraph)
.prf	printer driver (dBASE IV)
.prf	profiler output file
.prg	program source (dBASE IV - FoxPro - Clipper 5 - dBFast)
.prj	project file
.prm	parameters (many)
.prn	text file (Lotus 1-2-3 - Symphony)
.pro	PROLOG source code file
.pro	graphics profile file (DOS)
.prs	----- (Harward Graphics Win) plsamp.prs
.prs	printer resource file eg. fonts (WordPerfect for Win)
.prs	procedure (dBASE IV)
.prt	printer driver (Dr.Halo)
.prx	compiled program (FoxPro)
.ps	PostScript file (text/graphics) (ASCII)
.psf	PostScript printer font (ChiWriter)
.psm	symbol table of IDE (Turbo Pascal)
.pt3	device driver (Harward Graphics 3.0)
.pt3	template (PageMaker 3)
.pt4	template (PageMaker 4)
.pub	public key ring file (Pretty Good Privacy RSA System)
.pub	publication (Ventura Publisher)
.pw	text file (Professional Write)
.px	primary database index (Paradox)
.py	PYTHON script file
.pyc	compiled PYTHON script file
.pzd	----- (Pizazz Plus)
.pzo	----- (Pizazz Plus)
.pzx	memory save file (Pizazz Plus)
.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)
.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)
.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)
.qef	query file (Q+E for MS Excel)
.qfx	fax document (ql2fax)
.qlb	quick library (MS C/C++)
.qlc	----- (PostScript help file) atmfonts.qlc
.qpr	generated query program (FoxPro)
.qpr	print queue device driver (OS/2)
.qpx	compiled query program (FoxPro)
.qrs	Equation Editor support file (WordPerfect for Win)
.qrt	QRT ray tracing graphics file
.qry	query (dBASE IV)
.r8	raw graphics file (one byte per pixel) plane one
.ras	Sun Rasterfile graphics file
.rat	datafile (RATS)
.raw	raw RGB 24-bit graphics file
.rbf	datafile (Rbase)
.rc	Resource Compiler script file (MS C/C++ - Borland C++)
.rc	configuration file (emacs)
.rdx	datafile (Reflex)
.rec	datafile (EpiInfo)
.rec	record file (Sprint)
.rec	recorded macro file (MS Windows)
.red	path info (Clarion Modula-2)
.ref	cross-reference
.reg	registration file (Corel programs)
.rem	remarks
.req	request
.res	compiled resource (MS C/C++ - Borland C++)
.res	dBASE resources (dBASE IV)
.rex	REXX source code file
.rez	resource file
.rf	Sun raster graphics file
.rft	DCA/RFT Revisable Format Text file (IBM DisplayWrite 4.0-5.1)
.rgb	SGI RBG image file (SDSC Image Tool)
.rgx	symbol tables etc. info (ReaGeniX code generator)
.ri	----- (Lotus 1-2-3)
.rib	graphics file in Renderman format
.rix	ColoRIX VGA Paint graphics file
.rla	Wavefront raster image file (SDSC Image Tool)
.rlb	----- (Harward Graphics Win) hgw.rlb
.rle	Utah Run Length Encoded rasterfile graphic file (SDSC Image Tool)
.rmk	makefile (RMAKE)
.rn	XPL program for Nota Bene users
.rnd	Rendering Slide (AutoCAD AutoShade)
.rol	Adlib music file (Roland)
.rpd	database (RapidFile)
.rpt	report
.rs_	resource fork of a Macintosh file (Mac-ette)
.rsc	resource file (ViewMax)
.rsp	responce file (text file containing input expected by eg. LINK)
.rtf	Rich Text Format text file (Windows Word)
.rtf	Windows Help file script
.rtl	text file
.rtp	RTPatch software update package data file
.s$$	temporary sort file (Sprint)
.sal	datafile (SORITEC)
.sam	text file (Samna - Lotus Ami/Ami Pro)
.sav	backup file
.sb	audio file (signed byte)
.sbp	DML program (Superbase 4)
.sbr	support file (Source Browser)
.sbt	notes related to record (Suberbase 4 Windows)
.sc	display driver (Framework II)
.sc3	screen device driver (Harward Graphics 3.0)
.sc3	renamed dBASE III screen mask file (dBASE IV)
.sca	datafile (SCA)
.scc	text file
.scd	SCODL Scan Conversion Object Description Language graphic file
.scf	spelling checker configuration file (Symphony)
.scn	screen file (Kermit)
.sco	high score
.scr	screen - screen snapshot (dBASE IV - Procomm Plus)
.scr	script (Kermit)
.sct	screen memo (FoxPro)
.scx	screen (FoxPro)
.scy	security file (ReaGeniX)
.sda	Fidonet's Software Distribution Network file archive description
.sdf	System Data Format file (fixed lenght ASCII text)
.sdi	Software Distribution Network Info file
.sdn	Software Distribution Network compressd file archive (pak251.exe)
.sea	Self-Extracting compressed Macintosh file Archive
.sec	----- compressed file
.sec	secret key ring file (Pretty Good Privacy RSA System)
.seq	Atari animation file
.seq	Sequential Instruction File (Bubble Chamber)
.ses	session info (Clarion Modula-2)
.set	driver sets created by Install (Symphony)
.set	setup options file
.sf	IRCAM Sound File (CSound package - MixView sound sample editor)
.sf	WPS attribute storage (OS/2 WorkPlace Shell) wp_root.sf
.sfi	printer font (HP LaserJet landscape) (Ventura Publisher)
.sfl	printer font (HP LaserJet landscape) (Ventura Publisher)
.sfp	printer font (HP LaserJet portrait) (Ventura Publisher)
.sft	screen font (ChiWriter)
.sgi	IRIS graphics file
.sh	unix ASCII file archive created by SHAR (unshar.zip)
.sh3	presentation (Harward Graphics 3.0)
.shb	background (CorelShow)
.shg	segmented-graphics bitmap
.shk	compressed Apple II file archive created by SHRINKIT
.shm	shell macro (WordPerfect Library)
.shp	shape file and source file for text fonts (AutoCAD)
.shr	unix ASCII file archive created by SHAR (unshar.zip)
.shw	presentation (Harward Graphics 2.0 - CorelShow)
.shx	shape entities (AutoCAD)
.sik	backup file (Sicherungskopie) (MS Word)
.sit	compressed Macintosh archive created by STUFFIT (unsit30.zip)
.sl	S-Lang source code file	
.slb	slide library (AutoCAD)
.slc	compiled SALT script (Telix)
.sld	slide (AutoCAD)
.sli	slide (MAGICorp Slide Service)
.slk	SYLK Symbolic Link format data file (MultiPlan)
.slt	SALT Script Application Language for Telix script source (Telix)
.sm	SMALLTALK source code file
.sm	text file (Samna Word)
.smm	macro (Ami Pro)
.smp	sample
.smt	text file (Smart Ware II)
.snd	digitized sound file (Macintosh/ATARI/PC)
.sng	song (midi sound) file (Atari Cubase)
.sno	SNOBOL4 source code file
.sp	compressed file archive created by SPLINT (unix)
.spc	program (MS Multiplan)
.spc	temporary file (WordPerfect for Win)
.spd	Bitstream Typefaces font file (Harward Graphics 3.0)
.spf	slide presentation file (EnerGraphics)
.spg	glossary (Sprint)
.spl	compressed file archive created by SPLINT (splint.arc)
.spl	customized printer driver (Sprint)
.spl	print spooling file (MS Windows)
.spl	sample
.spm	----- (WordPerfect) wp{wp}.spm
.spp	printer file (Sprint)
.spr	document letter (Sprint)
.spr	genarated screen program (FoxPro)
.sps	SPSSx source code file (VAX/VMS)
.sps	screen driver (Sprint)
.spt	SPITBOL source code file
.spt	----- support file (MITAC disk/system management utility pack)
.spx	compiled screen program (FoxPro)
.sql	SQL data file
.sqz	compressed file archive created by SQUEEZE (sqz1082e.exe)
.src	source (DataFlex)
.srf	Sun Raster File graphics file
.ssd	datafile (SAS/PC)
.ssp	datafile (SAS Transport)
.st	SMALLTALK source code file (Little Smalltalk)
.std	State Transition Diagram graphic file (Prosa)
.stf	compressed file archive created by SHRINKTOFIT
.stm	State Transition Diagram model file (Prosa)
.str	structure list object file (dBASE Application Generator)
.sts	project status info (MS C/C++)
.sty	style library/sheet (WP for Win - MS Word - Ventura - HG Win)
.sui	SUIT library (Simple User Interface Toolkit)
.sun	Sun rasterfile graphics file
.sup	supplementary dictionary (WordPerfect for Win)
.svd	autosave file for document (MS Word)
.svg	autosave file for glossary (MS Word)
.svs	autosave file for style sheet (MS Word)
.sw	audio file (signed word)
.swp	document backup (Sprint)
.swp	swap file (DOS)
.sy3	symbol file (Harward Graphics 3.0)
.syd	----- backup of startup files created by QEMM (?) autoexec.syd
.sym	precompiled headers (Borland C++)
.sym	program symbol table (Power C)
.sym	symbol file (Harward Graphics 2.0 - MS Windows SDK)
.syn	SDSC Synu image file (SDSC Image Tool)
.syn	synonym file (MS Word 5)
.sys	system file: device driver or hardware configuration info (DOS)
.sys	datafile (SYGRAPH - SYSTAT - SPSS/PC)
.syw	----- (Harward Graphics Win) graphics file (symbol)
.t	tester symbol table (ReaGeniX code generator)
.tag	query tag name (DataFlex)
.tah	help file for Turbo Assembler (Borland C++)
.tar	compressed file archive created by TAR (pax2exe.zoo)
.taz	possibly 2x compressed ASCII file archive file.tar.Z under DOS
.tb1	font file (Borland Turbo C)
.tb2	font file (Borland Turbo C)
.tbk	memo backup (dBASE IV - FoxPro)
.tbk	toolbook (Asymetrix ToolBook)
.tbl	graphics file (Aldus Table Editor 2.0)
.tbs	text elements ?? (Textbausteine) (MS Word)
.tbx	table (Project Scheduler 4)
.tc	configuration file (Turbo C - Borland C++)
.tch	help file (Turbo C - Borland C++)
.td	configuration file (Turbo Debugger)
.tdb	database (TACT)
.tdf	outline font description (Bitstream)
.tdh	help file for Turbo Debugger (Borland C++)
.tdk	keystroke recording file (Turbo Debugger)
.tds	symbol table (Turbo Debugger)
.tel	host file (Telnet 2.2)
.tem	input template (IconAuthor)
.tem	Turbo Editor Macro Language script (Borland C++)
.tex	TeX text file
.tf	configuration file (Turbo Profiler)
.tfa	area file (Turbo Profiler)
.tfc	catalogue file (Tobi's Floppy Cataloguer)
.tfh	help file for Turbo Profiler (Borland C++)
.tfm	TeX Font Metric file (TeX)
.tfs	statistical information (Turbo Profiler)
.tga	Truevision Targa graphics file
.ths	thesaurus dictionary (WordPerfect for Win)
.tif	Tagged Image File Format bitmap graphics (PageMaker - CorelDRAW)
.til	fuzzy logic knowledge base (Togai InfraLogic Fuzzy-C Compiler)
.tlb	reference table (Bubble Chamber)
.tmf	Tagged Font Metric file (WordPerfect for Win)
.tmo	ZTG global optimizer default output file (Zortech C++)
.tmp	temporary file
.tms	script (Telemate)
.toc	Table Of Contents text file (ASCII)
.tp	configuration file (Turbo Pascal)
.tp3	template (Harward Graphics 3.0)
.tph	help file (Turbo Pascal)
.tpl	resident units (Turbo Pascal)
.tpl	template (Harward Graphics 2.0)
.tpp	Protected Mode Units (Borland Pascal 7.0)
.tpu	Turbo Pascal Unit (BGI) (Turbo Pascal)
.tpw	Turbo Pascal Unit (BGI) (Turbo Pascal for Windows)
.tr	man page input suitable for troff -man (cawf2.zip)
.trc	debugging support file (Power CTrace)
.tre	directory tree file (PC-Tools)
.trm	terminal settings (MS Windows)
.trn	translation support file (Quattro)
.trs	executable file (Micrografx)
.tst	printer test file (WordPerfect for Win)
.ttf	TrueType Font file
.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)
.txi	support file (TeX)
.txt	text file
.tym	Time Stamp (PageMaker 4)
.tzb	3x compressed ASCII file archive file.tar.Z.btoa under DOS
.ub	audio file (unsigned byte)
.ui	user interface (Sprint)
.uif	long prompts for windows (WordPerfect for Win)
.ul	uLAW audio file
.uld	information about uploaded files (Procomm Plus)
.uni	datafile (Forecast Pro)
.unx	text file containing UNIX specific info
.upd	update data (dBASE)
.upo	compiled update data (dBASE)
.usp	printer font with USASCII extended character set (PageMaker)
.usr	user database file (Procomm Plus - Turbo C++ tour)
.uu	compressed ASCII file archive created by UUDE/ENCODE
.uue	compressed ASCII file archive created by UUENCODE (uuexe515.exe)
.uw	audio file (unsigned word)
.v	consistency check support file (ReaGeniX code generator)
.val	validity checks and referential integrity (Paradox for Windows)
.val	values list object file (dBASE Application Generator)
.var	variable file (IconAuthor)
.vbx	Visual Basic eXtension (Visual Basic)
.vc	spreatsheet (VisiCalc)
.vcx	spreatsheet (VisiCalc Advanced)
.vew	view file (Clipper 5)
.vga	VGA display driver (many)
.vga	VGA display font (many)
.vgd	VGA display driver (Generic CADD)
.vgr	graphics file (Ventura Publisher)
.vic	VICAR graphics file
.vid	MS-DOS Shell Monitor file (MS-DOS 5)
.vid	screen device driver (Word)
.vif	Khoros Visualization image file (SDSC Image Tool)
.vik	VIKING graphics file
.vis	VIS graphics file
.vmf	font characteristics (Ventura Publisher)
.vms	text file containing VMS specific info
.voc	audio file (Soundblaster)
.vpg	graphics file (VPGraphics)
.vrs	video resource file eg. video device driver (WordPerfect)
.vst	Truevision Vista graphics file
.vue	view (dBASE IV - FoxPro)
.vw	text file (Volkswriter)
.vwr	file viewer file (PC Tools)
.vxd	Windows 3 virtual device driver (QEMM)
.w	word chart file (APPLAUSE)
.w30	printer font (AST TurboLaser) (Ventura Publisher)
.w31	startup file (MS Windows 3.1)
.wav	Microsoft Waveform audio file
.wbf	MS Windows Batch File (Catch)
.wbk	document/workbook (WordPerfect for Win)
.wcd	macro token list (WordPerfect for Win)
.wcm	macro (WordPerfect for Win)
.wcm	data transmission file (MS Works)
.wcp	product information description (WordPerfect for Win)
.wdb	database (MS Works)
.wfn	graphics file (Corel Symbol & Typeface)
.wfx	data file (Winfax)
.wid	width table (Ventura Publisher)
.win	window file (FoxPro - dBASE)
.wk1	spreadsheet (Lotus 1-2-3 version 2.x - Symphony 1.1+)
.wk3	spreadsheet (Lotus 1-2-3 version 3.x)
.wkb	document (WordPerfect for Win)
.wke	spreatsheet (Lotus 1-2-3 educational version)
.wkq	spreatsheet (Quattro Pro)
.wks	spreadsheet (Lotus 1-2-3 version 1A - Symphony 1.0 - MS Works)
.wks	workspace (Xlisp)
.wmc	----- backup of startup files by Windows MathCad autoexec.wmc
.wmc	macro file (WordPerfect for Win)
.wmc	text file (WordMARC)
.wmf	Windows MetaFile vector graphics (Windows 3)
.wn	text file (NeXT WriteNow)
.wnf	outline font description (CorelDRAW native format)
.woa	swap file (MS Windows)
.wp	text file (WordPerfect 4.2)
.wp5	text file (WordPerfect 5)
.wpd	display driver (WordPerfect)
.wpf	text file (WordPerfect)
.wpg	WordPerfect Graphics Format bitmapped file (DrawPerfect)
.wpk	macros (WordPerfect for Win)
.wpm	macros (WordPerfect)
.wps	text document (MS Works)
.wq!	compressed spreadsheet (Quattro Pro)
.wq1	spreadsheet (Quattro Pro)
.wr1	spreatsheet (Symphony 1.1 - 1.2 - 2)
.wrd	template (Charisma)
.wri	text file (Windows Write)
.wrk	spreatsheet (Symphony 1.0)
.wrp	compressed Amiga file archive created by WARP
.wrs	Windows printer driver (WordPerfect for Win)
.ws	text file (WordStar 5.0-6.0)
.ws2	text file (WordStar 2000)
.wsd	data file (WordStar)
.wst	text file (WordStar)
.wwb	button bar for document window (WordPerfect for Win)
.wwk	keyboard layout (WordPerfect for Win)
.x	AVS X image file (SDSC Image Tool)
.x	LEX source code file	
.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)
.xbm	X11 Bitmap graphics file
.xfn	printer font (Xerox 4045) (Ventura Publisher)
.xft	24 pin printer font (ChiWriter)
.xla	add-in macro sheet (MS Excel)
.xlb	----- (MS Excel)
.xlc	chart document (MS Excel)
.xll	Excel Dynamic Link Library (MS Excel)
.xlm	macro sheet (MS Excel)
.xls	worksheet (MS Excel)
.xlt	template (MS Excel)
.xlt	translation table (Lotus 1-2-3 - Symphony - Procomm Plus)
.xlw	workbook (MS Excel)
.xpm	X11 Pixel Map graphics file
.xqt	macro sheet (SuperCalc)
.xrf	cross-reference file
.xwd	X Window System window dump image graphics file (SDSC Image Tool)
.xwp	text file (Xerox Writer)
.xxe	compressed file ASCII archive created by XXENCODE (uuexe515.exe)
.xy	text file (XY Write)
.xy3	text file (XYWrite III)
.xyw	text file (XyWrite III)
.y	YACC grammar file
.y	compressed Amiga file archive created by YABBA
.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	----- (Arts & Letters) custom/nature.yal
.z	compressed file ASCII archive created by COMPRESS (comp430d.zip)
.zip	compressed file archive created by PKZIP (pkz204g.exe)
.zom	compressed Amiga file archive created by ZOOM
.zoo	compressed file archive created by ZOO (zoo210.exe)
.zvd	ZyXEL Voicefile (Z-Fax)
.~mn	menu backup (Norton Commander)