The movie clip you mention is spam - many people complain of downloading it. Does it have a .mov extension? I think you can avoid downloading it again by adding .mov to your LW filter.
Have you read this?
Info on fake files
or this?
Filtering porn and spam
Maybe you should read this, too...
[URL="http://www.gnutellaforums.com/showthread.php?t=58603"*********** info/links[/URL]
Good Luck