*** EDIT ***
Opps, only 51 Icons ... mhh ... 102 Icons of fun
List of Icons:
3DS (3D Studio Max or other 3D Apps)
ANI (Flash or other Animation Apps)
ASL (Editor with ASL Language Support)
C4D (Cinema 4D)
CLC (Calculator)
COH (Company of Heroes OR City of Heroes)
COM (Computer)
CRY (Crysis)
CSS (CSS Editor)
DOC (Documents)
DRW (Dreamweaver)
DSK (Desktop)
DSL (Internet Dial-Up)
END (End of ... mhh ... Shut Down

)
EXC (Excel)
EXT (External Storage)
FH (Freehand)
FLA (Flash)
FOX (Firefox ... not Fox Network

)
FRW (Fireworks)
FTP (FTP-Client or Server)
GFX (Graphic Apps ... )
GMP ( ... like GIMP)
GO (GO ... mhh ... simple GO)
HME (Home)
HTM (HTML-Editor)
ICQ (ICQ)
IE6 (Internet Explorer 6 ... pls use firefox or some other browser)
IE7 (Internet Explorer 7)
INT (Internal)
IRC (IRC Client)
MAC (MacOS)
MOV (Quicktime or other Movie-Players)
MP3 (MP3 Player like Winamp)
MSG (Messenger like Trillian, MSN)
NAT (Router)
NET (Network)
NTP (Notepad)
OUT (Outlook)
PHP (PHP-Editor)
PS (Photoshop)
SAF (Safari)
THB (Thunderbird)
TOR (BitTorrent-Client line µTorrent or Azureus)
UT3 (Unreal Tournament 3)
VLC (VLC Player)
WAR (Warhammer Online)
WIN (Windows)
WMP (Windows Media Player)
What is the program used