This file is indexed.

/usr/share/xscreensaver/config/engine.xml is in xscreensaver-gl 5.36-1ubuntu1.

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="engine" _label="Engine" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=8BL2o8QJmiA"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="30000"
          convert="invert"/>

  <select id="engine">
   <option id="random" _label="Random engine"/>
   <option id="1" _label="Honda Insight (3 cylinders)"     arg-set="-engine honda_insight"/>
   <option id="2" _label="BMW M3 (4 cylinders)"            arg-set="-engine bmw_m3"/>
   <option id="3" _label="VW Beetle (4 cylinders, flat)"   arg-set="-engine vw_beetle"/>
   <option id="4" _label="Audi Quattro (5 cylinders)"      arg-set="-engine audi_quattro"/>
   <option id="5" _label="BMW M5 (6 cylinders)"            arg-set="-engine bmw_m5"/>
   <option id="6" _label="Subaru XT (6 cylinders, V)"      arg-set="-engine subaru_xt"/>
   <option id="7" _label="Porsche 911 (6 cylinders, flat)" arg-set="-engine porsche_911"/>
   <option id="8" _label="Corvette Z06 (8 cylinders, V)"   arg-set="-engine corvette_z06"/>
   <option id="9" _label="Dodge Viper (10 cylinders, V)"   arg-set="-engine dodge_viper"/>
   <option id="10" _label="Jaguar XKE (12 cylinders, V)"   arg-set="-engine jaguar_xke"/>
  </select>

  <boolean id="titles" _label="Show engine name" arg-set="-titles"/>
  <hgroup>
    <boolean id="wander" _label="Wander" arg-unset="-no-move"/>
    <boolean id="spin" _label="Spin" arg-unset="-no-spin"/>
  </hgroup>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <xscreensaver-updater />

  <_description>
Internal combusion engines.

https://en.wikipedia.org/wiki/Internal_combustion_engine#Operation

Written by Ben Buxton, Ed Beroset and Jamie Zawinski; 2001.
  </_description>
</screensaver>