This file is indexed.

/usr/share/mime/packages/apt.xml is in software-properties-gtk 0.82.7.

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="text/x-apt-sources-list">
		<sub-class-of type="text/plain"/>
		<comment>Software sources list</comment>
		<glob pattern="sources.list"/>
	</mime-type>
</mime-info>