Can't get .midi files to play using PlayMusic

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I can play the .mid files fine from within Windows MediaPlayer and Magix Midi Studio.

I can't play them from Blitz3D (I have Blitz3D version IDE 1.85, Linker 1.64, Runtime 1.85) nor from BlitzPlus (ver IDE 1.35, Linker 1.10, Runtime 1.37) either as executables or from within Blitz.

This all happens regardless of the .mid file I substitute.
The strange thing is that it used to work fine a while back. I don't remember when exactly it stopped working.