those files are illegal codes for pirated programs or games that are being shared.
Limewire isn't a program you want to mess around with...much like Kazaa for file sharing, they are notorious for passing around virus filled files, not to mention all the spyware that gets installed with the Limewire program itself. Avoid this place like the plague.....
TONI
i know this will seem silly but what does KEYGEN and or Crack mean on some files on Limewire?
Seth

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic