How to avoid downloading bogus movie files:

Highlight a file in your Search Window, right-click & scroll down to Advanced, select "Lookup File with Bitzi". You will find info re audio/video quality, or if the file is bogus or mis-named.

I'd say that at least 95% of (mostly AVI) files that I've looked up are listed at Bitzi. I like LimeWire far much more now because Bitzi tells me about the exact file that I'm considering.