500	Play / Pause
501	Stop
502	Previous Track
503	Next Track
504	Mute
505	Volume Up
506	Volume Down
507	Close
508	Close MPXP
509	Close MPXP Tray Toy
510	Close Both
511	Run Windows Media Player
512	Run MPXP Tray Toy at Startup
513	Use separate libraries for each user
514	Options
515	Hide Media Player
516	Show Media Player
517	Clear MRU
518	Turn off MPXP MRU
540	Windows Media Player
541	MPXP Tray Toy