Lesson1ST

Extensions the most current :
.7z : zip file (powerarchiver)
.8b(a, c, e, f, i, p, s, x, y and .8li) : photoshop plugins (photoshop)
.aa : audio file (winamp)
.aac : audio file (winamp)
.ace : zip file (powerarchiver)
.adts : audio file (quicktime)
.aiff : audio file (winamp)
.asf : video file (winamp)
.avi : video file (winamp)
.bdc : babylon dictionary (babylon)
.bkf : backup file (system backup)
.bmp : bitmap windows (acdsee)
.cab : zip file (powerarchiver)
.cdr : coreldraw graphic (coreldraw)
.class : class auto file (winamp/internet browser)
.cpt : corel photo-paint picture (corel photo-paint)
.csc : corel script (corelscript)
.cur : cursor file (cursor editor)
.dat : data file (system file)
.dll : system library file (system file)
.doc : word document (word)
.dos : ms-dos file (ms-dos commands)
.dot : word template (word)
.dwt : dreamweaver template (dreamweaver)
.epim : essential pim database (essential pim)
.eps : encapsulated postscript (photoshop/coreldraw)
.exe : application (application)
.flp : fruityloops project (fruityloops)
.gif : bitmap compuserve (acdsee)
.gz : gzip file (powerarchiver)
.hlp : help file (windows help)
.htm(l) : hypertext markup language file (internet/frontpage)
.ico : icon (icon editor)
.ini : system file (system file)
.iso : zip file (powerarchiver)
.jar : zip file -especially under linux- (powerarchiver)
.jpg (and derivate) : jpeg file (acdsee)
.js : javascript file (frontpage/internet)
.key : regedit key (regedit)
.lnk : shortcut (application)
.m3u : winamp playlist (winamp)
.mid : midi file (winamp)
.mp3 : mpeg file (winamp)
.mswmm : windows movie maker project (movie maker)
.obd : office binder (binder msoffice)
.odb : opendocument database (star office)
.odf : opendocument maths (star office)
.odg : opendocument draw (star office)
.odp : opendocument impress (star office)
.ods : opendocument spreadsheet (star office)
.odt : opendocument text (star office)
.pae : zip file encrypted (powerarchiver)
.pcast : podcast (itunes)
.pdf : portable document file (adobe reader)
.png : portable network graphic file (acdsee)
.pps : powerpoint diaporama (powerpoint)
.ppt : powerpoint presentation (powerpoint)
.psd : photoshop file (photoshop)
.pwr : poweralbum file (poweralbum)
.rar : zip file (powerarchiver/winrar)
.reg : regedit file (regedit)
.rsm : rastop file (rastop)
.rtf : rich text format (word/staroffice)
.snp : snapshot file (snapshot)
.sxw : staroffice 1.1 text (star office)
.sys : system file (system file)
.tar : zip file (powerarchiver)
.tex : corel texture file (corel texture)
.tiff : tiff picture (acdsee)
.txt : text file (notepad)
.url : internet shortcut (internet browser)
.vbs : visual basic script (visual basic application, internet)
.wav : audio file (winamp)
.wma : windows media audio (winamp)
.wmv : windows media video (winamp)
.xlm : excel macrosheet (excel)
.xls : excel spreadsheet (excel)
.xlt : excel template (excel)
.zip : zip file (powerarchiver)

Damn that's a lot....
Thanks! It will be quite useful for my computing frequency (university semester test).