.mid

MIDI music event file driving synthesizers, opened by DAWs and players

Handled by macOS itself

Format facts

MIME type: audio/midi
Apple UTI: public.midi-audio
Stock Quick Look: no stock preview
Planned approach (census): native-sufficient
Icon hint: plays
Prevalence: universal

Renderer note (from the census)

macOS plays MIDI natively using DLS synth

Gotchas: no audio data, just instructions