This file is indexed.

/usr/share/xscreensaver/config/gleidescope.xml is in xscreensaver-gl-extra 5.15-3ubuntu1.

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="gleidescope" _label="Gleidescope">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="20000"
          convert="invert"/>

  <number id="size" _label="Size of tube" arg="-size %"
	  type="slider" _low-label="Small" _high-label="Large"
	  low="0" high="10" default="0" />

  <number id="duration" type="slider" arg="-duration %"
          _label="Image duration"
          _low-label="10 seconds" _high-label="5 minutes"
          low="10" high="300" default="30"/>

  <hgroup>
   <boolean id="move"	_label="Move"   arg-unset="-no-move"/>
   <boolean id="rotate"	_label="Rotate" arg-unset="-no-rotate"/>
   <boolean id="zoom"	_label="Zoom"   arg-set="-zoom"/>
   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  </hgroup>

  <xscreensaver-image />

  <_description>
A kaleidoscope that operates on your desktop image, or on
image files loaded from disk.  

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

Written by Andrew Dean; 2003.
  </_description>
</screensaver>