I have, in the past 2 months encountered maybe 15-20 such files... several were the ones that had the !-! in the name. Others gave no outward indication in the naming. To rule out a player I tried Winamp, Music Match, Irfanview and Real One players.... the nature of the ones I have found appeared to be genuine attempts at spoofing real files. - but then, that's just me. - I was not considering a potential bug in a client - my bad.