This file is indexed.

/usr/share/xscreensaver/config/rubik.xml is in xscreensaver-gl-extra 5.36-1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="rubik" _label="Rubik" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=AQdJgvyVkXU"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="20000"
          convert="invert"/>

  <number id="count" type="spinbutton" arg="-count %"
          _label="Count" low="-100" high="100" default="-30"/>

  <number id="cycles" type="slider" arg="-cycles %"
           _label="Rotation" _low-label="Slow" _high-label="Fast"
          low="3" high="200" default="20"
          convert="invert"/>

  <number id="size" type="spinbutton" arg="-size %"
           _label="Size" low="-20" high="20" default="-6"/>

  <boolean id="shuffle" _label="Hide shuffling" arg-set="-hideshuffling"/>

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <xscreensaver-updater />

  <_description>
A Rubik's Cube that repeatedly shuffles and solves itself.
See also the "GLSnake" and "Cube21" screen savers.

https://en.wikipedia.org/wiki/Rubik%27s_Cube

Written by Marcelo Vianna; 1997.
  </_description>
</screensaver>