Ashark [1] filed a deletion request for kde-servicemenus-thunderbird- attachment [2]: Abandoned (author is not active, last update in 2018). The upstream url is gone. The source .desktop is taken right from aur git. [1] https://aur.archlinux.org/account/Ashark/ [2] https://aur.archlinux.org/pkgbase/kde-servicemenus-thunderbird-attachment/