MIDI Instrument Definition File
From Just Solve the File Format Problem
				
								
				
				
																
				
				
								
				A MIDI Instrument Definition File is a RIFF like container that remaps the General MIDI patch set and drum note assignments for a MIDI sound source that is not GM compliant.[1]
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Identification
.IDF files start with ASCII "RIFF", have "IDF LIST" at offset 8, and MMAPhdr  at offset 20.
[2]
Software
- Microsoft's IDFedit Program
- RIFFPad

