Please consider registering media types to the Internet Assigned Numbers
Authority (IANA) before requiring their inclusion in /etc/mime.types.
https://www.iana.org/form/media-types
Simplified registration procedures for vendor and personal trees have been
implemented since RFC 6838, that states: "it should rarely, if ever, be
necessary to use unregistered types."
https://tools.ietf.org/html/rfc6838
I have confirmed that the process is fairly quick and painless by registering
various media types in 2012, 2014 and 2020.
-- Charles Plessy
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