This file is indexed.

/usr/share/xscreensaver/config/matrixview.xml is in rss-glx 0.9.1-6+b2.

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="matrixview" _label="MatrixView">

  <command arg="-r"/>

  <number id="01" type="slider" arg="-s %"
          _label="Scene Interval" _low-label="Shorter" _high-label="Longer"
          low="0" high="120" default="5"/>

  <number id="02" type="slider" arg="-m %"
          _label="Matrix Interval" _low-label="Shorter" _high-label="Longer"
          low="3" high="120" default="5"/>

  <number id="03" type="slider" arg="-X %"
          _label="Horizontal Resolution" _low-label="Higher" _high-label="Lower"
          low="40" high="320" default="90"/>

  <number id="04" type="slider" arg="-Y %"
          _label="Vertical Resolution" _low-label="Higher" _high-label="Lower"
          low="30" high="240" default="70"/>

  <string id="05" _label="Photo directory" arg="-i %" />

  <number id="06" type="slider" arg="-c %"
          _label="Contrast" _low-label="Low" _high-label="High"
          low="0" high="100" default="75"/>

  <_description>
Seeing things in the matrix.

Written by Alex Zolotov &lt;nightradio at knoppix.ru&gt;
Ported to Linux by Tugrul Galatali - &lt;http://rss-glx.sourceforge.net/&gt;.
  </_description>
</screensaver>