This file is indexed.

/usr/share/kde4/apps/kwin/DefaultTabBoxLayouts.xml is in kde-window-manager-common 4:4.8.2a-0ubuntu4.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="utf-8"?>
<tabbox_layouts>
    <layout name="Default" highlight_selected_icon="true" grayscale_deselected_icon="false">
        <row>
            <element type="2" icon_size="32.0" width="40.0" row_span="true" />
            <element type="0" stretch="true" small="false" bold="true" italic="false" italic_minimized="true" prefix_minimized="(" suffix_minimized=")" horizontal_alignment="center" />
        </row>
        <row>
            <element type="3" width="40.0" />
            <element type="1" stretch="true" small="true" italic="true" horizontal_alignment="center" />
        </row>
    </layout>
    <layout name="Compact" highlight_selected_icon="true" grayscale_deselected_icon="false">
        <row>
            <element type="2" icon_size="16.0" width="24.0" />
            <element type="0" stretch="true" bold="true" italic_minimized="true" prefix_minimized="(" suffix_minimized=")" horizontal_alignment="left" vertical_alignment="bottom" small="true" />
        </row>
    </layout>
    <layout name="Small Icons" highlight_selected_icon="true" grayscale_deselected_icon="false">
        <row>
            <element type="2" icon_size="16.0" width="20.0"/>
        </row>
    </layout>
    <layout name="Big Icons" highlight_selected_icon="true" grayscale_deselected_icon="false">
        <row>
            <element type="2" icon_size="64.0" width="80.0"/>
        </row>
    </layout>
    <layout name="Text" highlight_selected_icon="false" grayscale_deselected_icon="false">
        <row>
            <element type="0"  stretch="true" italic_minimized="false" horizontal_alignment="center" />
        </row>
    </layout>
    <layout name="Desktop" highlight_selected_icon="true" grayscale_deselected_icon="true">
        <row>
            <element type="2" icon_size="32.0" width="40.0" row_span="true" />
            <element type="1" stretch="true" bold="true" horizontal_alignment="left" />
        </row>
        <row>
            <element type="3" width="40.0" />
            <element type="4" stretch="true" layout_mode="horizontal" layout_name="Small Icons"/>
        </row>
    </layout>
    <layout name="Desktop Informative" highlight_selected_icon="true" grayscale_deselected_icon="true">
        <row>
            <element type="2" icon_size="32.0" width="40.0" row_span="false" />
            <element type="1" stretch="true" bold="true" horizontal_alignment="center" />
        </row>
        <row>
            <element type="4" stretch="true" layout_mode="vertical" layout_name="Compact"/>
        </row>
    </layout>
</tabbox_layouts>