This file is indexed.

/usr/share/xscreensaver/config/moebius.xml is in xscreensaver-gl 5.15-3+deb7u1.

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="moebius" _label="Moebius">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="20000"
          convert="invert"/>

  <boolean id="solid" _label="Solid floor" arg-set="-solidmoebius"/>
  <boolean id="ants" _label="Draw ants" arg-unset="-no-ants"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
This animates a 3D rendition M.C. Escher's "Moebius Strip II",
an image of ants walking along the surface of a moebius strip.

http://en.wikipedia.org/wiki/Moebius_strip
http://en.wikipedia.org/wiki/Maurits_Cornelis_Escher

Written by Marcelo F. Vianna; 1997.
  </_description>
</screensaver>