.[0-9]+gf	TeX generic font files
.[0-9]+pk	TeX packed font files
.[1-9][a-z]	manual page for section plus subsection
.[1-9]	manual page for the corresponding section
.ada	Ada source (may be body, spec, or combination)
.adb	Ada body source
.ads	Ada spec source
.ad	X application default resource file
.afm	PostScript font metrics
.al	Perl autoload file
.am	automake(1) input file
.arc	arc(1) archive
.arj	arj(1) archive
.asc	PGP ASCII-armoured data
.asm	(GNU) assember source file
.a	static object code library
.au	Audio sound file
.aux	LaTeX auxiliary file
.avi	(msvideo) movie
.awk	AWK language program
.bak	backup file
.bash	bash(1) shell script
.bb	basic block list data produced by
.bbg	basic block graph data produced by
.bbl	BibTeX output
.bdf	X font file
.bib	TeX bibliographic database, BibTeX input
.b	LILO boot loader image
.bm	bitmap source
.bmp	bitmap
.bz2	file compressed using bzip2(1)
.cat	message catalog files
.cc	C++ source
.c	C source
.C	C++ source code, equivalent to .cc
.cf	configuration file
.cfg	configuration file
.cgi	WWW content generating script or program
.class	Java compiled byte-code
.cls	LaTeX Class definition
.conf	configuration file
.config	configuration file
.cpp	equivalent to .cc
.csh	csh(1) shell script
.cxx	equivalent to .cc
.dat	data file
.deb	Debian software package
.def	Modula-2 source for definition modules
.def	other definition files
.desc	initial part of mail message unpacked with munpack(1)
.diff	file differences (diff(1) command output)
.dir	dbm data base directory file
.doc	documentation file
.dsc	Debian Source Control (source package)
.dtx	LaTeX package source file
.dvi	TeX's device independent output
.elc	compiled Emacs-Lisp source
.el	Emacs-Lisp source
~	Emacs or patch(1) backup file
.eps	encapsulated PostScript
.exp	Expect source code
.f77	Fortran 77 source
.f90	Fortran 90 source
.fas	pre-compiled Common-Lisp
.f	Fortran source
.F	Fortran source with cpp(1) directives or file compressed using freeze
.fi	Fortran include files
.fig	FIG image file (used by xfig(1))
.fmt	TeX format file
.gif	Compuserve Graphics Image File format
.gmo	GNU format message catalog
.gsf	Ghostscript fonts
.gz	file compressed using gzip(1)
.h	C or C++ header files
.help	help file
.hf	equivalent to .help
.hlp	equivalent to .help
.hqx	7-bit encoded Macintosh file
.html	HTML document used with the World Wide Web
.htm	poor man's .html
.icon	bitmap source
.i	C source after preprocessing
.idx	reference or datum-index file for hypertext
.image	bitmap source
.in	configuration template, especially for GNU Autoconf
.info-[0-9]+	splitted info files
.info	files for the Emacs info browser
.ins	LaTeX package install file for docstrip
.itcl	itcl source code; itcl ([incr Tcl]) is an OO extension of tcl
.java	a Java source file
.jpeg	Joint Photographic Experts Group format
.jpg	poor man's .jpeg
.kmap	lyx(1) keymap
.l	equivalent to .lex or .lisp
.lex	lex(1) or flex(1) files
.lha	lharc archive
.lib	Common-Lisp library
.lisp	Lisp source
.ln	files for use with lint(1)
.log	log file, in particular produced by TeX
.lsm	Linux Software Map entry
.lsp	Common-Lisp source
.lzh	lharc archive
.m4	m4(1) source
.mac	macro files for various programs
.man	manual page (usually source rather than formatted)
.map	map files for various programs
.me	Nroff source using the me macro package
.mf	Metafont (font generator for TeX) source
.mgp	MagicPoint file
.mm	sources for groff(1) in mm - format
.m	Objective-C source code
.mod	Modula-2 source for implementation modules
.mo	Message catalog binary file
.mov	(quicktime) movie
.mp2	MPEG Layer 2 (audio) file
.mp3	MPEG Layer 3 (audio) file
.mpeg	movie file
.mp	Metapost source
.old	old or backup file
.o	object file or database system
.orig	backup (original) version of a file, from patch(1)
.out	output file, often executable program (a.out)
.pag	dbm data base data file
.patch	file differences for patch(1)
.pbm	portable bitmap format
.pcf	X11 font files
.pdf	Adobe Portable Data Format (use Acrobat/acroread or xpdf)
.perl	Perl source (see .ph, .pl and .pm)
.pfa	PostScript font definition files, ASCII format
.pfb	PostScript font definition files, binary format
.pgm	portable greymap format
.pgp	PGP binary data
.php3	PHP3 program file
.ph	Perl header file
.php	PHP program file
.pid	File to store daemon pid (e.g. crond.pid)
.pl	TeX property list file or Perl library file
.pm	Perl module
.png	Portable Network Graphics file
.pod	perldoc(1) file
.po	Message catalog source
.p	Pascal source
.ppm	portable pixmap format
.pr	bitmap source
.ps	PostScript file
.pyc	compiled python
.py	Python source
.qt	quicktime movie
rc	startup (`run control') file, e.g. .newsrc
.rej	patches that patch(1) couldn't apply
.rpm	RedHat software package
.r	RATFOR source (obsolete)
.rtf	Rich Text Format file
.rules	rules for something
.s	assembler source
.S	assembler source with cpp(1) directives
.sa	stub libraries for a.out shared libraries
.scm	Scheme source code
.sc	sc(1) spreadsheed commands
.sed	sed source file
.sgml	SGML source file
.shar	archive created by the shar(1) utility
.sh	sh(1) scripts
.so	Shared library or dynamically loadable object
.sql	SQL source
.sqml	SQML schema or query program
.sty	LaTeX style files
.sym	Modula-2 compiled definition modules
.tar	archive created by the tar(1) utility
.tar.bz2	tar(1) archive compressed with bzip2(1)
.tar.gz	tar(1) archive compressed with gzip(1)
.tar.Z	tar(1) archive compressed with compress(1)
.taz	tar(1) archive compressed with compress(1)
.tcl	tcl source code
.texi	equivalent to .texinfo
.texinfo	Texinfo documentation source
.tex	TeX or LaTeX source
.text	text file
.tfm	TeX font metric file
.tgz	tar archive compressed with gzip(1)
.tiff	Tagged Image File Format
.tif	poor man's .tiff
.tk	tcl/tk script
.tmpl	template files
.tmp	temporary file
.txt	equivalent to .text
.uue	binary file encoded with uuencode(1)
.uu	equivalent to .uue
,v	files for RCS (Revision Control System)
.vf	TeX virtual font file
.vpl	TeX virtual property list file
.wav	wave sound file
.web	Donald Knuth's WEB
.wml	Source file for Web Meta Language
.w	Silvio Levi's CWEB
.xbm	X11 bitmap source
.xcf	GIMP graphic
.xml	eXtended Markup Language file
.xpm	X11 pixmap source
.xsl	XSL stylesheet
.xs	Perl xsub file produced by h2xs
.Y	file compressed using yabba
.y	yacc(1) or bison(1) (parser generator) files
.Z	file compressed using compress(1)
.z	File compressed using pack(1) (or an old gzip(1))
.zip	zip(1) archive
.zoo	zoo(1) archive
