This file is indexed.

/usr/share/xscreensaver/config/circuit.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="circuit" _label="Circuit" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=tfqR1j1OQs8"/>

  <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="slider" arg="-parts %"
          _label="Parts" _low-label="One" _high-label="Lots"
          low="1" high="30" default="10"/>

  <number id="speed" type="slider" arg="-rotate-speed %"
          _label="Rotation speed" _low-label="Slow" _high-label="Fast"
          low="0" high="100" default="1"/>
  <boolean id="spin"   _label="Spin" arg-unset="-no-spin"/>

  <select id="render">
    <option id="flat"  _label="Flat coloring" arg-set="-no-light"/>
    <option id="light" _label="Directional lighting"/>
  </select>

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

  <xscreensaver-updater />

  <_description>
Electronic components float around.

Written by Ben Buxton; 2001.
  </_description>
</screensaver>