This file is indexed.

/usr/share/xscreensaver/config/flame.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="flame" _label="Flame">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=6Pu8JKNT_Jk"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="50000"
          convert="invert"/>

  <number id="delay2" type="slider" arg="-delay2 %"
          _label="Linger" _low-label="0 seconds" _high-label="10 seconds"
          low="1000" high="10000000" default="2000000"/>

  <number id="iterations" type="slider" arg="-iterations %"
          _label="Number of fractals" _low-label="Few" _high-label="Many"
          low="1" high="250" default="25"/>

  <number id="points" type="slider" arg="-points %"
          _label="Complexity" _low-label="Low" _high-label="High"
          low="100" high="80000" default="10000"/>

  <number id="ncolors" type="slider" arg="-colors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="1" high="255" default="64"/>

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

  <xscreensaver-updater />

  <_description>
Iterative fractals.

Written by Scott Draves; 1993.
  </_description>
</screensaver>