for viewing only purposes, i would recommend using a 3rd party player like vlc or mplayer osx. although divx 6 can enable divx on quicktime and on other apps, the performance isn't as good as the 3rd party apps, thus reducing viewing experience.
the other 3rd party players have good performance, quality, and control options. you can chose both, which is what i have done. i installed divx 6 and use vlc player.