This file is indexed.

/usr/share/mime/packages/x-iwork-keynote-sffkey.xml is in calligra-data 1:2.9.7-0ubuntu12.

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"?>
<!--
 Remove as soon as this lands in shared-mime-info and we depend on that version.
-->
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
  <mime-type type="application/x-iwork-keynote-sffkey">
    <comment>Apple Keynote 5 presentation</comment>
    <sub-class-of type="application/zip"/>
    <generic-icon name="x-office-presentation"/>
    <magic priority="50">
      <match type="string" value="PK\003\004" offset="0">
        <match type="string" value="index.apxl" offset="30"/>
      </match>
    </magic>
    <glob pattern="*.key"/>
    <alias type="application/vnd.apple.keynote"/>
  </mime-type>
</mime-info>