Tiny application for Windows Media Player control via shortcuts. WMP must be running before executing any command.

Use following parameters (only one each time) in a shortcut.
-pause for play/pause
-volup for volume up
-voldown for volume down
-next for next track
-prev for previous track

It should work all WM 5 and later devices (both PPC/SP platforms).

http://forum.xda-developers.com/showthread.php?t=451550