Where did you get it and what is it? What's the filetype? Is this on a disc? wtf?
It sounds like you downloaded something from somewhere (questionable), and I'm not particularly motivated to help with that.
I would just point you to VLC player, and one of the various forums out there that deal with these kinds of things.
And btw, this question is entirely in an erroneous forum, this has nothing at all to do with HDTV software media.