My HDTV card records broadcast HD in its native MPG format (MPEG-2 video + AC3 audio, I think). These files are then playable in Windows Media Player, RealPlayer, zPlayer, Mplayer, etc. But I need to play in Showtime, because I would then like NeroVision to convert the files to other forms (MPEG-4, DVD, etc.).
Here is a sample (11MB) file: