This file is indexed.

/usr/share/xscreensaver/config/xjack.xml is in xscreensaver-data-extra 5.15-2ubuntu1.

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="xjack" _label="XJack">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Speed" _low-label="Slow" _high-label="Fast"
          low="0" high="200000" default="50000"
          convert="invert"/>

  <!-- #### -font [] -->

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

  <_description>
This behaves schizophrenically and makes a lot of typos.

Written by Jamie Zawinski; 1997.
  </_description>
</screensaver>