Can't get .midi files to play using PlayMusic

This is what's listed in the control panel:
Microsoft GS Wavetable SW Synth

There are no others listed.

Under that key you mentioned there are two other keys with additional keys:

+Microsoft GS Wavetable SW Synth [Emulated]
 +Out
   DMPortGUID = 6c 5a 46 99 90 39 72 42 ac b3 61 c6 6d 9d 0a ff

+Microsoft MIDI Mapper [Emulated]
 +Out
   DMPortGUID = 05 0e a0 b3 1f c0 0d 4a 8b 7e ca 79 1a 40 bd d7

Does any of it mean anything to you?