This file is indexed.

/usr/share/xscreensaver/config/maze.xml is in xscreensaver-data-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="maze" _label="Maze">

  <command arg="-root"/>

  <video href="http://www.youtube.com/watch?v=-u4neMXIRA8"/>

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

    <select id="generator">
      <option id="mrandom" _label="Random maze generator"/>
      <option id="m0"      _label="Depth-first backtracking maze generator"
                           arg-set="-generator 0"/>
      <option id="m1"      _label="Wall-building maze generator (Prim)"
                           arg-set="-generator 1"/>
      <option id="m2"      _label="Set-joining maze generator (Kruskal)"
                           arg-set="-generator 2"/>
    </select>

    <hgroup>
     <select id="ignorance">
       <option id="smart" _label="Head toward exit"/>
       <option id="dumb"  _label="Ignorant of exit direction"
               arg-set="-ignorant"/>
     </select>

    </hgroup>

    <hgroup>
     <number id="grid-size" type="spinbutton" arg="-grid-size %"
             _label="Grid size" low="0" high="100" default="0"/>
     <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
    </hgroup>

   </vgroup>

   <vgroup>
    <number id="pre-delay" type="slider" arg="-pre-delay %"
            _label="Linger before solving"
            _low-label="0 seconds" _high-label="10 seconds"
            low="0" high="10000000" default="2000000"/>

    <number id="post-delay" type="slider" arg="-post-delay %"
            _label="Linger after solving"
            _low-label="0 seconds" _high-label="10 seconds"
            low="0" high="10000000" default="4000000"/>

    <xscreensaver-updater />

   </vgroup>
  </hgroup>


  <_description>
Generates random mazes, with three different algorithms: Kruskal,
Prim, and a depth-first recursive backtracker.  It also solves them.
Backtracking and look-ahead paths are displayed in different colors.

https://en.wikipedia.org/wiki/Maze_generation_algorithm
https://en.wikipedia.org/wiki/Maze_solving_algorithm

Written by Martin Weiss, Dave Lemke, Jim Randell, Jamie Zawinski,
Johannes Keukelaar, and Zack Weinberg; 1985.
  </_description>
</screensaver>