the HTC Home plugin that tantrum829 posted is Duttys' custom HTC Home plugin. that should do the trick. I never used the HHC before, did it by hand, but I remember to change the default media player it uses you can change this key here:
HKEY_LOCAL_MACHINE\SOFTWARE\HTC\Music Plug-In
dword value of 1 gives you Windows Media Player, value of 2 gives you HTC Audio Manager.
or...maybe its the OTHER way around. like i said....been a LONG time since I used it.