This file is indexed.

/usr/share/xscreensaver/config/apple2.xml is in xscreensaver-data-extra 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="apple2" _label="Apple2">

 <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=p3QZqhp67l8"/>

 <hgroup>
  <vgroup>
   <select id="mode">
    <option id="random"    _label="Choose display mode randomly"/>
    <option id="text"      _label="Display scrolling text" arg-set="-mode text"/>
    <option id="slideshow" _label="Display images"         arg-set="-mode slideshow"/>
    <option id="basic"     _label="Run basic programs"     arg-set="-mode basic"/>
   </select>

   <xscreensaver-text />
  </vgroup>
  <vgroup>
   <number id="duration" type="slider" arg="-duration %"
           _label="Duration" _low-label="10 seconds" _high-label="10 minutes"
           low="10" high="600" default="60"/>

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

   <vgroup>
    <number id="tvcolor" type="slider" arg="-tv-color %"
            _label="Color Knob" _low-label="Low" _high-label="High"
            low="0" high="1000" default="70"/>
    <number id="tvtint" type="slider" arg="-tv-tint %"
            _label="Tint Knob" _low-label="Low" _high-label="High"
            low="0" high="100" default="5"/>
    <number id="tvbrightness" type="slider" arg="-tv-brightness %"
            _label="Brightness Knob" _low-label="Low" _high-label="High"
            low="0" high="200" default="150"/>
    <number id="tvcontrast" type="slider" arg="-tv-contrast %"
            _label="Contrast Knob" _low-label="Low" _high-label="High"
            low="0" high="1500" default="1000"/>
   </vgroup>
  </hgroup>

 <_description>
An Apple ][+ computer simulation, in all its 1979 glory.  It also
reproduces the appearance of display on a color television set of the
period.

In "Basic Programming Mode", a simulated user types in a BASIC program
and runs it.  In "Text Mode", it displays the output of a program, or
the contents of a file or URL.  In "Slideshow Mode", it chooses random
images and displays them within the limitations of the Apple ][
display hardware.  (Six available colors in hi-res mode!)

On MacOS and Linux, this program is also a fully-functional VT100
emulator!  Run it as an application instead of as a screen saver and
you can use it as a terminal.

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

Written by Trevor Blackwell and Jamie Zawinski; 2003.
  </_description>
</screensaver>