Just in case Cassp,

If you updated windows mediaplayer, look if the midi files are assigned to the windows media player!
(options->filetypes->uncheque midi. just in case the midifiles are assigned to the windows mediaplayer)
Restart your computer.
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76