Yes, there are many fake & infected files around these days. It's not LW doing it Many are spam, shared simply to sabotage p2p. Some contain more malicious malware & why these jerks spread virii around...good question. See here for virus probs on network:
http://www.gnutellaforums.com/showth...threadid=41432

See also:
http://www.gnutellaforums.com/showth...164#post104164

And:
http://www.gnutellaforums.com/showth...threadid=41870

All the more reason to be really careful with what you download & to learn how to recognise crap