Okay, I managed to get the DivX to open in QuickTime Player (yeah!) - but, no sound.
Sound only plays through DivX Player because of the bloody WMA *sigh*
Maybe if I split the audio from the movie, reencode the DivX to a .mov via QuickTime Pro (for video), then using Final Cut Pro composite the two... argh. Not enough HD space. Oh well... at least it's doable.