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they are perfectly legal SMF (standard MIDI files), only that they include special MPE mode setup and performance events, which are special MIDI (N)RPN events that in turn are normal MIDI CC events, just with designated special values, according to the MPE spec.

so, you'll have to read and decode the MIDI file and look for those special magic events that often occur at the head of the first MTrk section, usually for MPE Configuration Message (MCM), which is plain MIDI RPN 00 06.

hth.