text/x-texmacs
#✎[4] texmacs/packages/haiku/text-x-texmacs.rdef at e3febc844c52d8691c7a1b2a5f20cfbcf6c176bb · texmacs/texmacs · GitHub, https://github.com/texmacs/texmacs/blob/e3febc844c52d8691c7a1b2a5f20cfbcf6c176bb/packages/haiku/text-x-texmacs.rdef
[5] MIME type for apps - Software / Native - Haiku Community, https://discuss.haiku-os.org/t/mime-type-for-apps/9368/8