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I want QuickTime Player to auto-play a file when I execute that file from Finder.

The default behaviour is to simply load the file and wait for you to press play.

I found a default pref that you can set to force QuickTime X to play movie files automatically.

defaults write com.apple.QuickTimePlayerX MGPlayMovieOnOpen 1

How can you force QuickTime to play all its files automatically, regardless of their type (mp3, wav, aac, etc)

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Using the default will command QuickTime to start playback of the loaded file.

defaults write com.apple.QuickTimePlayerX MGPlayMovieOnOpen 1

It's not file specific, or movie specific. It will play all files, regardless of type if you run this command, and restart QuickTime.

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    This will not work for QuickTime Player on macOS Sierra. – Cœur Nov 3 '17 at 1:56
  • Doesn't work in High Sierra either, sadly. – jtheletter Feb 7 '18 at 21:38

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