This file is indexed.

/usr/share/applications/screensavers/rubik.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=Rubik
Exec=/usr/lib/xscreensaver/rubik -root
TryExec=/usr/lib/xscreensaver/rubik
Comment=Draws a Rubik's Cube that rotates in three dimensions and repeatedly shuffles and solves itself. See also the "GLSnake" and "Cube21" screen savers. http://en.wikipedia.org/wiki/Rubik%27s_Cube Written by Marcelo Vianna.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;