This file is indexed.

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

<screensaver name="strange" _label="Strange">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=F1qna7UAxC0"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="10000"
          convert="invert"/>

  <number id="points" type="slider" arg="-points %"
            _label="Number of points" _low-label="1k" _high-label="100k"
            low="1000" high="100000" default="5500"/>

  <number id="ncolors" type="slider" arg="-ncolors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="1" high="255" default="100"/>

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

  <xscreensaver-updater />

  <_description>
Strange attractors: a swarm of dots swoops and twists around.

https://en.wikipedia.org/wiki/Attractor#Strange_attractor

Written by Massimino Pascal; 1997.
  </_description>
</screensaver>