How do I change the playback settings for DivX (.avi, .divx) or DivX Plus (.mkv) files in a third-party media player?

To change playback settings for DivX or DivX Plus files in third-party media players go to: Start > Programs > DivX > Codec Settings

This will launch the DivX Control Panel where you can make changes to various codec settings such as brightness, saturation, deblocking, and hardware acceleration.