Converting Musicmatch "preference" to WMP star rating

I've got a lot of time invested in rating all of my MP3
files with Musicmatch's "Preference" rating
(i.e. "excellent", "very good", etc.). Now, I'd like to
switch to Windows Media Player, but the preference
ratings don't automatically get translated into WMP 9's
star ratings.

I gather that this is because Musicmatch stores their
preference information in a custom id3 tag "comment"
section -- I can't tell where WMP stores its star
ratings...

Does anyone know of a way to convert Musicmatch
preference info into WMP 9's stars? Is there a tool
available?

Thanks,
day