It is always a good idea to check large files withy the bitzi web site. If you right click on a file in the search Window, you will find the option advanced> check file with Bitz look up (or something similar).
also VLC is a good player which often works when other players don't
http://www.videolan.org/vlc/
iTunes will not play all videos.
This link has more imformartion on Bitzi.
http://www.gnutellaforums.com/showth...threadid=37676
I hope this helps