DivX Sound question

I’ve recently encoded a divX file with 5.1 channel sound, and the sound isn’t showing up on Windows Media Player 10. I’ve tried playing the file on the DivX Playa (the divx player that comes with DivX), and the sound is fine, but for whatever reason it won’t play through WM 10. Has anyone else had this issue? How do I allow sound to play?

I appreciate any help. Thanks