i second the last post. i had one or two of these in the past and while they played fine in vlc, there really wasn't much else that could be done with them.
another package format that will slip into obscurity. hopefully.
however. you could by all means attempt (and i dont know what with) to extract the video and audio files, and hope to find the subtitles elsewhere, if you need them, and recombine them in a format of you liking. sounds like a lot of work for one video though.
another thing to consider: if the file is already less than, say, 1GB and you plan to convert it to some other format...it probably wont look pretty.
im not sure if i just helped anyone. im going to go ahead and say no. 😱