Ok having read around a bit it would seem that most genuine mac files will be .bin, .sit, or .dmg. I have however downloaded .dmg files which still open up as .exe files. If someone could confirm that I should just look for .sit or .dmg that would be great.

Secondly, it sounds like the downloaded files that I thought were mac programs are in fact viruses. Unfortunately I am also running Virtual PC with Windows XP on it - could these files have infected XP? It seems to run quite slowly.

Any help would be appreciated by a complete limewire novice!

Cheers