This file is indexed.

/usr/share/xscreensaver/config/glsnake.xml is in xscreensaver-gl 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="glsnake" _label="GLSnake" gl="yes">

  <command arg="-root"/>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Low" _high-label="High"
            low="0" high="100000" default="30000"
            convert="invert"/>

    <number id="duration" type="slider" arg="-statictime %"
            _label="Duration" _low-label="1" _high-label="30 seconds"
            low="1000" high="30000" default="5000"/>

    <number id="packing" type="slider" arg="-explode %"
            _label="Packing" _low-label="Tight" _high-label="Loose"
            low="0.0" high="0.5" default="0.03"/>
   </vgroup>
   <vgroup>

    <number id="angvel" type="slider" arg="-angvel %"
            _label="Angular velocity" _low-label="Slow" _high-label="Fast"
            low="0.05" high="5.0" default="1.0"/>
    <number id="yangvel" type="slider" arg="-yangvel %"
            _label="Y angular velocity" _low-label="Slow" _high-label="Fast"
            low="0.0" high="1.0" default="0.10"/>

    <number id="zangvel" type="slider" arg="-zangvel %"
            _label="Z angular velocity" _low-label="Slow" _high-label="Fast"
            low="0.0" high="1.0" default="0.14"/>

   </vgroup>
  </hgroup>


  <hgroup>
   <boolean id="labels" _label="Show titles"      arg-set="-titles"/>
   <boolean id="wire"    _label="Wireframe"       arg-set="-wireframe"/>
   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  </hgroup>

  <xscreensaver-updater />

  <_description>
The "Rubik's Snake" puzzle.  See also the "Rubik" and "Cube21" screen savers.

http://en.wikipedia.org/wiki/Rubik%27s_Snake

Written by Jamie Wilkinson, Andrew Bennetts, and Peter Aylett; 2002.
  </_description>
</screensaver>