This file is indexed.

/usr/share/xscreensaver/config/sproingies.xml is in xscreensaver-gl-extra 5.34-2ubuntu1.

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="sproingies" _label="Sproingies" gl="yes">

  <command arg="-root"/>

  <video href="http://www.youtube.com/watch?v=fmHl17ppgc0"/>

  <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="count" type="slider" arg="-count %"
           _label="Sproingies" _low-label="One" _high-label="Lots"
          low="1" high="30" default="8"/>

  <hgroup>
   <boolean id="nofall" _label="Fall off edge" arg-set="-fall"/>
   <boolean id="wire" _label="Wireframe" arg-set="-wireframe"/>
   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  </hgroup>

  <xscreensaver-updater />

  <_description>
Slinky-like creatures walk down an infinite staircase and 
occasionally explode!

https://en.wikipedia.org/wiki/Slinky
https://en.wikipedia.org/wiki/Q%2Abert
https://en.wikipedia.org/wiki/Marble_Madness

Written by Ed Mackey; 1997.
  </_description>
</screensaver>