OGG is an audio format. MIDI is a Musical Instrument Digital Interface format. Which means they are completely incompatible. There are programs out there that will "listen" to your music and attempt to find the notes in it and convert it to MIDI, but that only works it it's simple music playing one or a few notes at a time using one instrument. No talking or sound effects, obviously, and no percussion. Pretty much, if you can't get OGG to work on your computer, you probably won't find it easy to get it to work on others' computers either, so you should just stick with .MP3 or MP3-encoded .WAVs.