This file is indexed.

/usr/share/xscreensaver/config/tronbit.xml is in xscreensaver-gl-extra 5.34-2ubuntu1.

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="tronbit" _label="TronBit" gl="yes">

  <command arg="-root"/>

  <video href="http://www.youtube.com/watch?v=dIF4fodt-L8"/>

  <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="0.05" high="10.0" default="1.0"/>

  <hgroup>
   <boolean id="spin"    _label="Spin"            arg-unset="-no-spin"/>
   <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>
The character "Bit" from the film, "Tron".

The "yes" state is a tetrahedron; the "no" state is the second
stellation of an icosahedron; and the idle state oscillates between
a small triambic icosahedron and the compound of an icosahedron and
a dodecahedron.

https://en.wikipedia.org/wiki/List_of_Tron_characters#Bit
https://en.wikipedia.org/wiki/Uniform_polyhedra
https://en.wikipedia.org/wiki/Stellation

Written by Jamie Zawinski; 2011.
  </_description>
</screensaver>