/usr/lib/ruby/vendor_ruby/mime/types/audio.nonstandard is in ruby-mime-types 1.25-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | audio/x-aac @aac
audio/x-aiff @aif,aifc,aiff :base64
audio/x-midi @mid,midi,kar :base64
audio/x-ms-wax @wax
audio/x-ms-wma @wma
audio/x-ms-wmv @wmv
audio/x-pn-realaudio @ra,ram :base64
audio/x-pn-realaudio-plugin @rpm
audio/x-realaudio @ra :base64
audio/x-wav @wav :base64
*audio/webm @webm '{WebM=http://www.webmproject.org/code/specs/container/}
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