This file is indexed.

/etc/xdg/menus/mate-settings-welcome.menu is in ubuntu-mate-welcome 16.04.9.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!DOCTYPE Menu PUBLIC '-//freedesktop//DTD Menu 1.0//EN' 'http://standards.freedesktop.org/menu-spec/menu-1.0.dtd'>
<Menu>
    <Name>Desktop</Name>
    <Include>
            <Filename>ubuntu-mate-welcome.desktop</Filename>
    </Include>
    <Layout>
        <Merge type="menus"/>
        <Separator/>
        <Filename>ubuntu-mate-welcome.desktop</Filename>
        <Merge type="files"/>
    </Layout>
</Menu>