This file is indexed.

/usr/share/applications/screensavers/cube21.desktop is in xscreensaver-gl-extra 5.36-1ubuntu1.

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

The actual contents of the file can be viewed below.

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[Desktop Entry]
Name=Cube21
Exec=/usr/lib/xscreensaver/cube21 -root
TryExec=/usr/lib/xscreensaver/cube21
Comment=Animates a Rubik-like puzzle known as Cube 21 or Square-1. The rotations are chosen randomly. See also the "Rubik" and "GLSnake" screen savers. http://en.wikipedia.org/wiki/Square_One_%28puzzle%29 Written by Vasek Potocek.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;