I have no idea how you're getting a .DAT file, the only video links on that page are to a Famtasia movie, or a .torrent file of an AVI version.
From experience, the .torrents are usually never seeded, so I'd suggest installing Famtasia. Which can be found
Here and I can promise you that it will run the .FMV movie, as I just wacthed a portion of it.
