This file is indexed.

/usr/share/xscreensaver/config/penetrate.xml is in xscreensaver-data-extra 5.30-1+deb8u2.

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="penetrate" _label="Penetrate">

  <command arg="-root"/>

  <number id="bgrowth" type="slider" arg="-bgrowth %"
          _label="Explosions" _low-label="Slow" _high-label="Fast"
          low="1" high="20" default="5"/>

  <number id="lrate" type="slider" arg="-lrate %"
          _label="Lasers" _low-label="Slow" _high-label="Fast"
          low="10" high="200" default="80"
          convert="invert"/>

  <select id="mode">
    <option id="dumb"  _label="Start badly, but learn"/>
    <option id="smart" _label="Always play well" arg-set="-smart"/>
  </select>

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

  <xscreensaver-updater />

  <_description>
Simulates (something like) the classic arcade game Missile Command.

http://en.wikipedia.org/wiki/Missile_Command

Written by Adam Miller; 1999.
  </_description>
</screensaver>