/usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/appmenu/qmldir is in plasma-workspace 4:5.12.4-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | module org.kde.plasma.private.appmenu
plugin appmenuplugin
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