This file is indexed.

/usr/share/xscreensaver/config/topblock.xml is in xscreensaver-gl-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="topblock" _label="TopBlock">

  <command arg="-root"/>

  <hgroup>
   <vgroup>
    <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="dropspeed" type="slider" arg="-dropSpeed %"
            _label="Drop speed" _low-label="Slow" _high-label="Fast"
            low="1" high="9" default="4"/>

    <number id="size" type="slider" arg="-size %"
            _label="Carpet size" _low-label="Small" _high-label="Large"
            low="1" high="10" default="2"/>

    <number id="spawn" type="slider" arg="-spawn %"
            _label="Spawn likelyhood" _low-label="Low" _high-label="High"
            low="4" high="1000" default="50"
            convert="invert"/>

   </vgroup>
   <vgroup>
    <number id="resolution" type="slider" arg="-resolution %"
            _label="Polygon count" _low-label="Low" _high-label="High"
            low="4" high="20" default="4"/>

  <number id="maxColors" type="slider" arg="-maxColors %"
          _label="Colors" _low-label="Few" _high-label="Many"
          low="1" high="32" default="7"/>

  <number id="rotatespeed" type="slider" arg="-rotateSpeed %"
          _label="Rotation" _low-label="Slow" _high-label="Fast"
          low="1" high="1000" default="10"/>
   </vgroup>
  </hgroup>
 
  <hgroup>
   <boolean id="rotate" _label="Rotate"    arg-unset="-no-rotate"/>
   <boolean id="follow" _label="Follow"    arg-set="-follow"/>
   <boolean id="blob"   _label="Blob mode" arg-set="-blob"/>
   <boolean id="override" _label="Tunnel mode" arg-set="-override"/>
   <boolean id="carpet" _label="Carpet"    arg-unset="-no-carpet"/>
  </hgroup>
  <hgroup>
   <boolean id="nipples" _label="Nipples"  arg-unset="-no-nipples"/>
   <boolean id="wire"   _label="Wireframe" arg-set="-wireframe"/>
   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  </hgroup>

  <_description>
Creates a 3D world with dropping blocks that build up and up.
Written by rednuht; 2006.
  </_description>
</screensaver>