I believe these files are either Fakes, Corrupt, or Spam wanting you to Download a specific Player like 3WPlayer or DomPlayer to Open these Files.
Warning... These are Scams that will send you to a web site and ask you to Pay for the above mentioned Players to watch these Files.
IMO, Delete the Files and move on.
When Downloading ANY Video Files off of the Gnutella Network, ALWAYS USE BITZI!! See Instructions Below.
After you have completed your search, Right click on the file that you're interested in. Now go to Advanced > Lookup File With Bitzi. Left click on that and a new browser window will open which is Bitzi. Now you will see how other members have rated this file. If you see something like "Bitprint not found" then Leave it alone. Its probably a Fake or Corrupt File. If it has been Rated then you can read what or how the members feel about the file.
Hope this Helps.