This file is indexed.

/usr/share/mime/packages/x-k3b.xml is in k3b-data 2.0.2-7ubuntu1.

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-k3b">
        <sub-class-of type="application/zip"/>
        <comment>K3b project</comment>
        <comment xml:lang="de">K3b-Projekt</comment>
        <comment xml:lang="pl">Projekt K3b</comment>
        <glob pattern="*.k3b"/>
    </mime-type>
</mime-info>