MarsSeed [1] filed a deletion request for qmake-mimetypes [2]: Unneeded qtcreator 4.9 mimetype files from 2019 for development.
Repo carries the latest qtcreator-devel 11.0.1 package, which contains the current version of these files. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/qmake-mimetypes/
