Windows 7: play all button association

HI- in the Music folder, there's a "play all" button so you can play the whole album you've opened. When I click this button, it tries to play them all in WMP but I have set all my preferences and file associations for music to play with "media player classic".

I haven't actually initialized WMP yet (just reinstalled windows 7) and I'd prefer not to as it had a habbit before of randomly trying to play things that were no longer associated with it.

is there a way of dealing with this problem?

thanks.

EDIT: If you right-click a media file and choose 'Open with...' and select some alternate player other than WMP, the play all button will then use that player for that specific filetype.

when i had my last os set up, which was the same windows 7, pressing the button would mostly result in the music being played by media player classic, and sometimes by WMP. it maybe that I have to first launch WMP and then it will make the changes.