This file is indexed.

/etc/X11/Xsession.d/70xdg-kubuntu-dir is in kubuntu-settings-desktop 1:18.04ubuntu11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Added a path to put Kubuntu Settings
XDG_CONFIG_DIRS="$XDG_CONFIG_DIRS:/usr/share/kubuntu-default-settings/kf5-settings"