This file is indexed.

/usr/share/lxqt/themes/frost/wallpaper.cfg is in lxqt-common 0.11.2-2.

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

The actual contents of the file can be viewed below.

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wallpapers/size=1
wallpapers/1/file=lxqt-origami-light.png