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That's actually not true on macOS (Finder), which has a much more sophisticated^H^H abstruse system https://eclecticlight.co/2022/12/24/how-does-macos-tell-the

• hot_gril 4y ago
  So if I understand correctly, if you have a file with an unknown type then change the extension to something still unknown, it'll preserve the first default editor you set for the file.