file extension name

Data Files :
csv	Comma Separated Values file
dat	Data File
efx	eFax Document
epub	Open eBook File
Pps	PowerPoint Slideshow
ppt	PowerPoint Presentation
Pptx	PowerPoint Open XML Presentation
sdf	Standard Data File.
xm	XML File
Audio file
aif	Audio Interchange File Formate
Iff	Interchange File Formate
m3u	Media Playlist File
m4a	MPEG-4 Audio File
mid	MIDI File
mp3	MP3 Audio File
mpa	MPEG-2 Audio File
ra	Real Audio File
wav	WAVE Audio File
wma	Windows Media Audio File
webfiles:-
css	Cascading Style Sheet
html	Hypertext Markup Language File
js	JavaScript File
jsp	Java Server Page
php	Hypertext Preprocessor File
rss	Rich Site Summary
xhtml	Extensible Hypertext Markup
Video Files:
3g2	3GPP2 Multimedia File
3gp	3GPP Multimedia File
asf	Advanced Systems Formate File
asx	Microsoft ASF Redirector File
avi	Audio Video Interleave File
flv	Flash Video file
mov	Apple Quicktime Movie
mp4	MPEG-4 Video File
mpg	MPEG Video File
rm	Real Media File
srt	SubRip Subtitle File
swf	Shockwave Flash Movie
vob	DVD Video Object file
wmv	Windows Media Video file
Compressed Files
.7z	7-Dip Compressed File
rar	Winrar Compressed Archive
rpm	Red Hat Package Manager File
zip	Zipped File
Font Files :
fnt	Window Font File
fon	Generic Font File
otf	Open Type Font
ttf	TrueType Font
Backup File
bak	Backup File
tmp	Temporary File