/usr/lib/ruby/vendor_ruby/mime/types/application.mac is in ruby-mime-types 1.25-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | mac:application/x-apple-diskimage @dmg
mac:application/x-mac @bin :base64
mac:application/x-macbase64 @bin :base64
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