This file is indexed.

/usr/share/xscreensaver/config/twang.xml is in xscreensaver-data-extra 5.30-1+deb8u2.

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="twang" _label="Twang">

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

  <number id="event-chance" type="slider" arg="-event-chance %"
          _label="Randomness" _low-label="Slow" _high-label="Jumpy"
          low="0.0" high="0.1" default="0.01"/>

  <number id="friction" type="slider" arg="-friction %"
          _label="Friction" _low-label="Low" _high-label="High"
          low="0.0" high="0.2" default="0.05"/>

  </vgroup>
  <vgroup>

  <number id="springiness" type="slider" arg="-springiness %"
          _label="Springiness" _low-label="Low" _high-label="High"
          low="0.0" high="1.0" default="0.1"/>

  <number id="transference" type="slider" arg="-transference %"
          _label="Transference" _low-label="Low" _high-label="High"
          low="0.0" high="0.1" default="0.025"/>

  <number id="tile-size" type="slider" arg="-tile-size %"
         _label="Tile size" _low-label="Small" _high-label="Large"
         low="10" high="512" default="120"/>

  <number id="border-width" type="spinbutton" arg="-border-width %"
         _label="Border width" low="0" high="20" default="3"/>

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

  </vgroup>
  </hgroup>

  <xscreensaver-image />

  <xscreensaver-updater />

  <_description>
Divides the screen into a grid, and plucks them.

Written by Dan Bornstein; 2002.
  </_description>
</screensaver>