port fc1f74fd09d76a9c0bc50b148a7da15468a8653b from Pd-l2ork: *fixed bug in...

port fc1f74fd09d76a9c0bc50b148a7da15468a8653b from Pd-l2ork:  *fixed bug in midifile where its helpfile was inappropriately named, thus failing to open appropriate help file.