This file is indexed.

/usr/share/xscreensaver/config/blocktube.xml is in xscreensaver-gl-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="blocktube" _label="BlockTube" gl="yes">

  <command arg="-root"/>

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

  <number id="holdtime" type="slider" arg="-holdtime %"
          _label="Color hold time" _low-label="Short" _high-label="Long"
          low="10" high="2000" default="1000"/>

  <number id="changetime" type="slider" arg="-changetime %"
          _label="Color change time" _low-label="Short" _high-label="Long"
          low="10" high="1000" default="200"/>

  <boolean id="tex"     _label="Textured"  arg-unset="-no-texture"/>
  <boolean id="wire"    _label="Wireframe"   arg-set="-wireframe"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <xscreensaver-updater />

  <_description>
A swirling, falling tunnel of reflective slabs. They fade from hue to hue.

Written by Lars R. Damerow; 2003.
  </_description>
</screensaver>