This file is indexed.

/usr/share/mime/packages/keepassx.xml is in keepassx 2.0.3-1.

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-keepass2">
    <comment>KeePass 2 database</comment>
    <glob pattern="*.kdbx"/>
    <icon name="application-x-keepassx"/>
  </mime-type>
</mime-info>