Wondering if you can help with a problem.

I can play my voicemail back off my laptop - very nice feature btw - however I also have a HTC Dual Touch that runs Mobile Media Player 10 and it cannot play back the wav files generated by the VFX server.  I know the iPHONE, Crackberry and the Nokia N95 can all play these files because I have tested them on friend's phones, but not WM10!!

Any thoughts?   Other than buy a new phone!!