The aspect ratio is locked into the film.
But most media players allow you to change the aspect ratio when playing the film itself. Have you tried that?
Does anyone know if there is a DVD-burning program that will burn movies that have higher aspect ratios so they don't look squeezed when played on a DVD player? In other words, more choices than just 16:9 or 4:3. Or perhaps there is a program that will letterbox higher aspect ratio movies? Any info will be much appreciated...