This file is indexed.

/usr/share/xscreensaver/config/pong.xml is in xscreensaver-data-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="pong" _label="Pong">

  <command arg="-root"/>

  <number id="speed" type="slider" arg="-speed %"
          _label="Game speed" _low-label="Slow" _high-label="Fast"
          low="1" high="20" default="6"/>

 <number id="noise" type="slider" arg="-noise %"
          _label="Noise" _low-label="Crisp" _high-label="Noisy"
          low="0.00" high="5.00" default="0.04"/>

  <boolean id="clock" _label="Clock mode" arg-set="-clock"/>

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

  <_description>
This simulates the 1971 Pong home video game, as well as
various artifacts from displaying it on a color TV set.

In clock mode, the score keeps track of the current time.

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

Written by Jeremy English and Trevor Blackwell; 2003.
  </_description>
</screensaver>