This file is indexed.

/usr/share/xscreensaver/config/m6502.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="m6502" _label="m6502">

  <command arg="-root" />

  <number id="displaytime" type="slider" arg="-displaytime %"
          _label="Display time for each program"
          _low-label="5 seconds" _high-label="2 minutes"
	  low="5" high="120" default="20" />

  <file id="file" _label="Assembly file" arg="-file %"/>

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

  <_description> 
This emulates a 6502 microprocessor.  The family
of 6502 chips were used throughout the 70's and 80's in machines
such as the Atari 2600, Commodore PET, VIC20 and C64, Apple ][,
and the NES. Some example programs are included, and it can also
read in an assembly file as input.

Original JavaScript Version by Stian Soreng: http://www.6502asm.com/.
Ported to XScreenSaver by Jeremy English.

Written by Stian Soreng and Jeremy English; 2007.
  </_description>
</screensaver>