This file is indexed.

/usr/share/xscreensaver/config/cubestack.xml is in xscreensaver-gl 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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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="cubestack" _label="CubeStack" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=rZi5yav6sRo"/>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Low" _high-label="High"
            low="0" high="100000" default="30000"
            convert="invert"/>

    <number id="speed" type="slider" arg="-speed %"
            _label="Animation speed" _low-label="Slow" _high-label="Fast"
            low="0.1" high="10" default="1.0"/>
   </vgroup>
   <vgroup>
    <number id="thickness" type="slider" arg="-thickness %"
            _label="Thickness" _low-label="Thin" _high-label="Thick"
            low="0.0" high="0.5" default="0.13"/>

    <number id="opacity" type="slider" arg="-opacity %"
            _label="Opacity" _low-label="Transparent" _high-label="Opaque"
            low="0.01" high="1.0" default="0.7"/>
   </vgroup>
  </hgroup>

  <hgroup>
   <boolean id="wander" _label="Wander"    arg-unset="-no-wander"/>
   <boolean id="wire"   _label="Wireframe" arg-set="-wireframe"/>
   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  </hgroup>

  <xscreensaver-updater />

  <_description>
An endless stack of unfolding, translucent cubes.

Written by Jamie Zawinski; 2016.
  </_description>
</screensaver>