How to change which video codec the system uses

[ultim]

Hi
my system has always used CoreAVC codec to play my hi-def videos. But now ive installed powerdvd, it uses powerdvd codec to play the movies even though im not using the powerdvd program. im using media player classic.

How do i change which codec the system uses for my hi-def movies?

thanks

 

[ultim]

nobody knows?

 

[ultim]

Thanks, got it working now!
In options under external filters i just add the CoreAVC filter and tick prefer.