**User:** `update-mime-database` `~/.local/share/flatpak/exports/share/mime`
**System:** `update-mime-database` `/var/lib/flatpak/exports/share/mime/`

**User:** `~/var/lib/flatpak/exports/share/mime/packages/net.retrodeck.retrodeck.mime.xml`
**System:*** `/var/lib/flatpak/exports/share/mime/packages/net.retrodeck.retrodeck.mime.xml`