This file is indexed.

/usr/share/mime/packages/subtitlecomposer.xml is in subtitlecomposer 0.6.6-2.

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-ssa">
		<comment>SubStation Alpha subtitles</comment>
		<acronym>SSA</acronym>
		<expanded-acronym>SubStation Alpha</expanded-acronym>
		<sub-class-of type="text/plain"/>
		<magic priority="50">
			<match type="string" value="[Script Info]" offset="0:256">
				<match type="string" value="ScriptType: V4.00" offset="0:256"/>
			</match>
		</magic>
		<generic-icon name="text-x-generic"/>
		<glob pattern="*.ssa"/>
	</mime-type>

	<mime-type type="text/x-ass">
		<comment>Advanced SubStation Alpha subtitles</comment>
		<acronym>ASS</acronym>
		<expanded-acronym>Advanced SubStation</expanded-acronym>
		<sub-class-of type="text/plain"/>
		<magic priority="50">
			<match type="string" value="[Script Info]" offset="0:256">
				<match type="string" value="ScriptType: V4.00+" offset="0:256"/>
			</match>
		</magic>
		<generic-icon name="text-x-generic"/>
		<glob pattern="*.ass"/>
	</mime-type>

	<!-- Included in freedesktop.org database but misses *.txt glob
		 and for some reason txt files are not recognized without it
		 (unlike TMPlayer txt files).
	-->
	<mime-type type="text/x-microdvd">
		<comment>MicroDVD subtitles</comment>
		<sub-class-of type="text/plain"/>
		<magic priority="50">
			<match type="string" value="{1}" offset="0"/>
			<match type="string" value="{0}" offset="0"/>
			<match type="string" value="}{" offset="0:6"/>
		</magic>
		<generic-icon name="text-x-generic"/>
		<glob pattern="*.sub"/>
		<glob pattern="*.txt"/>
	</mime-type>

	<!-- Included in freedesktop.org database but misses *.mpsub glob -->
	<mime-type type="text/x-mpsub">
		<comment>MPSub subtitles</comment>
		<acronym>MPSub</acronym>
		<expanded-acronym>MPlayer Subtitle</expanded-acronym>
		<sub-class-of type="text/plain"/>
		<magic priority="50">
			<match type="string" value="FORMAT=" offset="0:256"/>
		</magic>
		<generic-icon name="text-x-generic"/>
		<glob pattern="*.mpsub"/>
		<glob pattern="*.sub"/>
	</mime-type>

	<!-- Included in freedesktop.org database
	<mime-type type="application/x-subrip"/>
	-->

	<!-- Included in freedesktop.org database
	<mime-type type="text/x-subviewer"/>
	-->

	<mime-type type="text/x-mplsub">
		<comment>MPLSub subtitles</comment>
		<acronym>MPSub</acronym>
		<expanded-acronym>MPlayer Subtitle</expanded-acronym>
		<sub-class-of type="text/plain"/>
		<generic-icon name="text-x-generic"/>
		<glob pattern="*.mpl"/>
	</mime-type>

	<mime-type type="text/x-tmplayer">
		<comment>TMPlayer subtitles</comment>
		<sub-class-of type="text/plain"/>
		<generic-icon name="text-x-generic"/>
		<magic priority="40">
			<match type="string" value="xx\:xx\:xx\:" mask="0x0000ff0000ff0000ff" offset="0"/>
			<match type="string" value="xx\:xx\:xx\:" mask="0x0000ff0000ff0000ff" offset="9:256"/>
		</magic>
		<glob pattern="*.sub"/>
	</mime-type>

	<mime-type type="text/x-tmplayer+">
		<comment>TMPlayer+ subtitles</comment>
		<sub-class-of type="text/plain"/>
		<generic-icon name="text-x-generic"/>
		<magic priority="40">
			<match type="string" value="xx\:xx\:xx=" mask="0x0000ff0000ff0000ff" offset="0"/>
			<match type="string" value="xx\:xx\:xx\,1=" mask="0x0000ff0000ff0000ffffff" offset="0">
				<match type="string" value="xx\:xx\:xx\,2=" mask="0x0000ff0000ff0000ffffff" offset="9:256"/>
			 </match>
		</magic>
		<glob pattern="*.sub"/>
	</mime-type>

	<mime-type type="application/x-vobsub">
		<comment>VobSub subtitles index</comment>
		<sub-class-of type="application/octet-stream"/>
		<generic-icon name="text-x-generic"/>
		<magic priority="50">
			<match type="string" value="# VobSub index file" offset="0"/>
		</magic>
		<glob pattern="*.idx"/>
	</mime-type>

	<mime-type type="application/x-subtitle-matrix">
		<comment>SubtitleComposer Symbol Matrix</comment>
		<sub-class-of type="text/plain"/>
		<generic-icon name="text-x-generic"/>
		<magic priority="50">
			<match type="string" value="SubtitleComposer Symbol Matrix v1.0" offset="0"/>
		</magic>
		<glob pattern="*.sym"/>
	</mime-type>
</mime-info>