This file is indexed.

/usr/share/xscreensaver/config/endgame.xml is in xscreensaver-gl 5.36-1ubuntu1.

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="endgame" _label="Endgame" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=QfglC_lvUTA"/>

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

  <boolean id="classic" _label="Low resolution chess pieces" arg-set="-classic"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <xscreensaver-updater />

  <_description>
Black slips out of three mating nets, but the fourth one holds him tight!
A brilliant composition! 

See also the "Queens" screen saver.

https://en.wikipedia.org/wiki/Chess_endgame

Written by Blair Tennessy and Jamie Zawinski; 2002.
  </_description>
</screensaver>