QuickTime format playing

In help chm, a saying goes as"Special format like DIVX or Quicktime require their filters to be installed, so they have to be included in the distribution."
I tried media_play on two avi files with divx and xvid codec, both videos go well.
But, all my mov format files cannot be played, just leaves black screen. Anyone can play *.mov in Acknex?

BTW, I have installed native quicktime player and can play my mov files using player well.
Can we say "Acknex can always play the videos that could be played well on window media player"?

Sounds like a missing codec but I didn't find any information if directx is still able to play QT. Why don't you simply convert your video to DivX?