I think the message below belongs here rather than in the thread you originally posted it.

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Subject: RE: Tech: Playing Midi Files on Linux
From: pavane - PM
Date: 13 Jul 10 - 08:30 AM

The OCX in my program is not used for playing the complete MIDI files (I think), but is used for directly playing individial notes and chords. I won't be able to look at the code until tonight, but I think I use calls to the standard Windows MMI (Multi Media interface) to play complete files.

So I don't really understand why this doesn't work in WINE.