This file is indexed.

/usr/share/xscreensaver/config/zoom.xml is in xscreensaver-data-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="zoom" _label="Zoom">

  <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="duration" type="slider" arg="-duration %"
          _label="Duration" _low-label="10 seconds" _high-label="10 minutes"
          low="10" high="600" default="120"/>

  <hgroup>
   <vgroup>
    <number id="pixwidth" type="spinbutton" arg="-pixwidth %"
            _label="X magnification" low="2" high="100" default="10"/>
    <number id="pixspacex" type="spinbutton" arg="-pixspacex %"
            _label=" X border width" low="0" high="10" default="2"/>
    <number id="lensoffsetx" type="spinbutton" arg="-lensoffsetx %"
            _label="   X lens offset" low="1" high="100" default="5"/>
   </vgroup>
   <vgroup>
    <number id="pixheight" type="spinbutton" arg="-pixheight %"
            _label="Y magnification" low="2" high="100" default="10"/>
    <number id="pixspacey" type="spinbutton" arg="-pixspacey %"
            _label=" Y border width" low="0" high="10" default="2"/>
    <number id="lensoffsety" type="spinbutton" arg="-lensoffsety %"
            _label="    Y lens offset" low="1" high="100" default="5"/>
   </vgroup>

   <vgroup>
    <boolean id="lenses" _label="Lenses" arg-unset="-no-lenses"/>
    <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
   </vgroup>

  </hgroup>

  <xscreensaver-image />

  <_description>
Zooms in on a part of the screen and then moves around.  With the
"Lenses" option, the result is like looking through many overlapping
lenses rather than just a simple zoom.

Written by James Macnicol; 2001.
  </_description>
</screensaver>