/usr/share/gdm/greeter/applications/mimeapps.list is in gdm3 3.28.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | [Default Applications]
x-scheme-handler/file=mime-dummy-handler.desktop
x-scheme-handler/ftp=mime-dummy-handler.desktop
x-scheme-handler/ghelp=mime-dummy-handler.desktop
x-scheme-handler/help=mime-dummy-handler.desktop
x-scheme-handler/http=mime-dummy-handler.desktop
x-scheme-handler/https=mime-dummy-handler.desktop
x-scheme-handler/info=mime-dummy-handler.desktop
x-scheme-handler/irc=mime-dummy-handler.desktop
x-scheme-handler/itms=mime-dummy-handler.desktop
x-scheme-handler/mailto=mime-dummy-handler.desktop
x-scheme-handler/man=mime-dummy-handler.desktop
x-scheme-handler/mms=mime-dummy-handler.desktop
x-scheme-handler/rtp=mime-dummy-handler.desktop
x-scheme-handler/rtsp=mime-dummy-handler.desktop
x-scheme-handler/sip=mime-dummy-handler.desktop
x-scheme-handler/trash=mime-dummy-handler.desktop
x-scheme-handler/webcal=mime-dummy-handler.desktop
x-scheme-handler/xmpp=mime-dummy-handler.desktop
|