The other day, possibly after reading the start of this thread, I realised I didn't have a simple MIDI player installed on my PC.
During a search, I happened across this free one, which displays the MIDI as sheet music and highlights the notes as they are played - Notation Player - {freeware}.
With multi part tunes, you can select the part for the instrument you want to hear or follow the dots for. You can also print the score or parts displayed.
It doesn't claim to produce a "perfect" score, as a MIDI file does not contain some info it would need, but it does seem to do a good enough job for most purposes, such as listening to the tune, looking at the dots and even playing along with it.

Quack!
GtD.