If you plan on installing the K-lite codec pack as well, downloading the latest version might save you some troubles, it has MPC as part of its default install.

could we can make the same thing with windows media player 9 ?

I would like use wmp9 faut all audio format & media player classic for all the video format

finally , Can we skip the windows media player configuration when it run for the first time ? and configure automaticly for only audio format ?

thanks for the tips for mpc

the only way I know of setting the associations with WMP9 is through regedits, and that's long and extensive and you have to do it for EACH extenstion you want.