This file is indexed.

/usr/share/xscreensaver/config/pacman.xml is in xscreensaver-data-extra 5.15-2ubuntu1.

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="pacman" _label="Pacman">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="10000"
          convert="invert"/>

  <number id="size" type="spinbutton" arg="-size %"
           _label="Player size" low="0" high="200" default="0"/>

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

  <_description>
Simulates a game of Pac-Man on a randomly-created level.

http://en.wikipedia.org/wiki/Pac-Man

Written by Edwin de Jong; 2004.
  </_description>
</screensaver>