Yes, Peerless, it seems more probable that the Server service is actually started by Shareaza, because it is required for file sharing. But the big server index, catalog.wci, is definitely the work of PG2.

You can't see it because it is hidden in the (normally) unreadable System Volume Information file. To access that file you have to change the access permissions (Start > Run > cmd > change to root directory of drive you want to access file on. Then cacls "system volume information" /t /g "Your user name":f )

That permanently (/t) grants you (/g "username") full access (:f) by editing the Access Control List (cACLs) for that file. Then you can look inside your SVI folder and delete stuff - but be careful because that's your system restore file (if you are still using System Restore).

@Neglacio, perhaps you could gently pass your friend at the Shareaza Security Centre the feedback that whilst X-Ray Filter looks like it could be useful... it is pretty difficult to trust or evaluate when he doesn't provide any documentation.