For a second opinion to Eric I downloaded the midi file, used "open project" in the file dropdown and it plays perfectly. No instruments are listed in the track header but that could be something to do with the program the midi file was written on and the way Mixcraft reads the midi info, or if any track info is present in the file. If you right click the little keyboard it will direct you to the instruments where you can make changes track by track by solo'ing each track in turn. I already made improvements within a minuet or so, I always find Mixcraft does a great job of midi files, mostly unbeatable imho. The midi file and Mixcraft work fine here.