Have you checked the file with Bitzi....
If it has been rated on Bitzi with positive feedback, you then know its a genuine file...If it has not been rated and comes up with Bitprint unknown, it is more than likely a dud, if you cant connect to it...
This link will show you how to use Bitzi....
http://www.gnutellaforums.com/showthread.php?t=37676