I created a movie of a phot montage and music using windows movie maker. I saved it as a wmv file. I used the software which was on my computer (sonyrx860), called Veritas, to burn the dvd. It went fine. I can play it on my computer. But I can't play it on my dvd player, sony or Mintek. Someone told me you have to switch from wmv file to mpg file for the dvd player to read the burned dvd. Is this true? If so, how do I change the file.