.au	sound file
.bz2	bzip2
.cacert	DER X.509 CA certificate
.class	Java bytecodes
.crypt	encrypted
.css	Cascading Style Sheets  (web nonsense)
.depend	dependency graph (uncompressed to simplify ftp server)
.dll	MS Windows binary
.doc	MS Word (uncompressed by available for unsophisticated users)
.dvi	TeX output
.enc	encrypted
.exe	DOS/Windows executable (self-uncompressing)
.executable	uncompressed binary executable (used only for distributing gzip)
.gif	GIF image file
.GIF	(UTenn is inconsistent in naming)
.gz	gzip   (available in /netlib/gnu/gzip/)
.jpeg	JPEG image file
.jpg	JPEG image file
.map	image map (uncompressed to simplify http server, and small anyway)
.mpg	MPEG image file
.PDF	PDF
.pdf	PDF
.png	graphics format
.ppt	MS PowerPoint (uncompressed but available for unsophisticated users)
.tab	font index for http://www.geom.umn.edu/~rminer/jmath/
.taz	compressed tar archive
.tgz	gzip'd tar archive
.trz	compressed tar archive
.z	compressed (maybe by an old version of gzip)
.Z	Unix compress
.zip	PKZIP

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