This file is indexed.

/etc/default/kdm.d/10_desktop-base is in desktop-base 8.0.2ubuntu1.

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

The actual contents of the file can be viewed below.

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USETHEME="true"
THEME="/usr/share/kde4/apps/kdm/themes/lines"
WALLPAPER="/usr/share/kde4/apps/kdm/themes/lines/background.svg"