You can simply rename MIDI file to MID should you need it, because it's just different extension of the same file format. there is no need for midi to mid conversion, although with some programs you may re-save .midi file to .mid, but this will only change the extension.
Open MIDI file Open MID fileA set of utilities for music notation conversion
A music composition and editing program
Tool for load your own WAV files into your Nord keyboard
A music composition and notation software
A music composition software
A music composition and editing environment
A music composing and notation software for Mac
A small music notation program