.ani Animation type file
.asc ASCII Text file
.avi Audio video Interlead animation file
.bak backup file
.bat batch file (DOS)
.bbs bulletin board System announce file
.bin binary file
.bmp bit map graphics file
.btm batch to memory batch file
.bpt bit map fill files ( corel draw)
.c C source code file
.cal Spread sheet file
.cbl COBOL source code file
.cpp C ++ Source code file
.rtf Rich text document file
.cur cursor image file
.dat data file in special format or ASCII
.dcf disk image file
.dem demonstration file
.dgs daignostics file
.dic dictionary file
.dir directory file
.dll Dynamic link library
.dmp dump file
.doc document text file
.dos text file containing dos specific info
.drv device driver
.dss screen save file
.ega EGA display font
.emu terminal emulation data
.err Error log file
.esh extended shell batch file
.exe directly executable program file
.fax raster graphics
.fix patch file
.frm form (Visual basic)
.gif graphics interchange format bitmap graphics
.gly glossary file
.hlp Help information file
.htm HTML document
.htx hyper text file .....
And many more extensions ....
