This file is indexed.

/usr/share/xscreensaver/config/skyrocket.xml is in rss-glx 0.9.1-6ubuntu4.

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="skyrocket" _label="Skyrocket">

  <command arg="-r"/>

  <number id="01" type="slider" arg="-m %"
          _label="Maximum number of rockets" _low-label="Less" _high-label="More"
          low="1" high="100" default="8"/>

  <number id="02" type="slider" arg="-s %"
          _label="Smoke lifespan (in seconds)" _low-label="Shorter" _high-label="Longer"
          low="0" high="60"  default="5"/>

  <number id="03" type="slider" arg="-S %"
          _label="Amount of smoke in explosions" _low-label="Less" _high-label="More"
          low="0" high="100"  default="0"/>

  <number id="04" type="slider" arg="-w %"
          _label="Wind speed" _low-label="Smaller" _high-label="Larger"
          low="0" high="100" default="20"/>

  <number id="05" type="slider" arg="-a %"
          _label="Ambient light" _low-label="Less" _high-label="More"
          low="0" high="100" default="10"/>

  <number id="06" type="slider" arg="-d %"
          _label="Star density" _low-label="Less" _high-label="More"
          low="0" high="100" default="20"/>

  <number id="07" type="slider" arg="-f %"
          _label="Lens flare brightness" _low-label="Less" _high-label="More"
          low="0" high="100" default="20"/>

  <number id="08" type="slider" arg="-g %"
          _label="Moon glow brightness" _low-label="Less" _high-label="More"
          low="0" high="100" default="20"/>

  <number id="09" type="slider" arg="-v %"
          _label="Sound effects volume" _low-label="Lower" _high-label="Higher"
          low="0" high="100" default="100"/>

  <hgroup>
    <boolean id="10" _label="Moon" arg-unset="-O"/>
    <boolean id="11" _label="Clouds" arg-unset="-C"/>
  </hgroup>
  <hgroup>
    <boolean id="12" _label="Illumination" arg-unset="-I"/>
    <boolean id="13" _label="Earth" arg-unset="-E"/>
  </hgroup>

  <_description>
Fireworks show.

Written by Terry Welsh &lt;mogumbo at totalmail.com&gt;.
Ported to Linux by Tugrul Galatali - &lt;http://rss-glx.sourceforge.net/&gt;.
Config Files by Curtis Haas.
  </_description>
</screensaver>