XVID 1.0.3 usually plays fine for me however 1.0.1 and another build which I forgot had issues with. Go to the #Transcode# folder to force it to transcode. Inside the transcode folder depending on how you lay out your files you will get individual folders for each episode or movie. If the file is already in its own folder enter that folder if its in like a public directory called TV you will have to enter that one and you will have to find the new folder for your file you want to transcode.
So as I can see your file name. You would go into the S Folder of your movie Drive and enter the #transcode# folder then find the Step Brother folder and it should give you a few selections for different transcoder if you haven't changed any of your settings in PMS or nothing too significant you should have MEncoder as your first transcode option. Simply just hit X and it will begin to transcode and playback.
The Data Type Unsupported means that the PS3 cannot natively playback the file and trasncoding will be required. So in the future if that ever happens again, just transcode it with the above method. Often some file types will transcode automatically however XVID can often stream fine, its just for some weird reason certain XVID builds do not work.
Core2Duo E8400 (@ 3.0), 8gigs of Mushkin, Vista Home Premium SP2 64bit, 2.5 TB of Space, Wired to Linksys WRT54G wired to 80GB MGS4 PS3 on Sharp 32" 720p LCD TV