This file is indexed.

/usr/share/mime/packages/x-mrpt-hmtmap.xml is in mrpt-apps 1:1.0.2-1ubuntu1.

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="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
  <mime-type type="application/x-mrpt-hmtmap">
    <comment>Robotic HMT map</comment>
    <glob pattern="*.hmtslam"/>
    <sub-class-of type="application/binary"/>
  </mime-type>
</mime-info>