Hi Joe, Windows Media Player (WMP) plays the MIDI files on my computer. Someone more tech-savvy than me can tell you how to make it happen automatically, but on a PC - and from memory - when you go into the file folder where the MIDI is saved, you right click on the name of a MIDI, then go down to Open With, and when that dropbox opens there is a line named Choose Default Program. Click on that and choose either Windows Media Player or whatever program works.

After that, any MIDI should open in that program by default, unless you change it again at a later date.

If the person's computer doesn't have WMP, then they might have to download or buy a program which does play MIDI files.

Another trick is to check that sound has not been muted, e.g. by checking the little speaker icon on the Windows taskbar - on the bottom of the window on my computer, on the other end of the taskbar which says "Start" on the furthest left. That's a tricky/pesky little issue that has caught me out sometimes.

That's about as far as my techo knowledge goes. I guess the question is, when people say that they can't play MIDI files, do they mean that the file won't open, or that the file opens but they can't hear it playing, or something else.