Those fiels are ad's and spam files. No need to bother with.
Read here to see what files could be dangerous:
http://www.gnutellaforums.com/showth...ht=Files+aware
http://www.gnutellaforums.com/download-upload-problems/35319-major-topics-upload-download-help.html
Files you want to download, you should always check with Bitzi (in the search results right-click on the file you're interested in, then go to "Advanced>Search>Look Up with Bitzi")
