This file is indexed.

/usr/share/xscreensaver/config/morph3d.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="morph3d" _label="Morph3D" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=lNtDppjOli4"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="40000"
          convert="invert"/>

  <select id="object">
   <option id="random" _label="Random object"/>
   <option id="tetra"  _label="Tetrahedron"  arg-set="-count 1"/>
   <option id="cube"   _label="Cube"         arg-set="-count 2"/>
   <option id="octa"   _label="Octahedron"   arg-set="-count 3"/>
   <option id="dodeca" _label="Dodecahedron" arg-set="-count 4"/>
   <option id="icosa"  _label="Icosahedron"  arg-set="-count 5"/>
  </select>

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

  <xscreensaver-updater />

  <_description>
Platonic solids that turn inside out and get spikey.

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

Written by Marcelo Vianna; 1997.
  </_description>
</screensaver>