This file is indexed.

/usr/share/dbus-1/interfaces/com.ubuntu.AccountsService.Sound.xml is in accountsservice-ubuntu-schemas 0.0.7+17.10.20170922-0ubuntu1.

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

The actual contents of the file can be viewed below.

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<node>
    <interface name="com.ubuntu.AccountsService.Sound">

        <annotation name="org.freedesktop.Accounts.VendorExtension" value="true"/>

        <annotation name="org.freedesktop.Accounts.Authentication.ChangeAny"
                    value="com.ubuntu.AccountsService.GreeterChangeAny"/>

        <annotation name="org.freedesktop.Accounts.Authentication.ReadAny"
                    value="com.ubuntu.AccountsService.GreeterReadAny"/>

        <property name="Volume" type="d" access="readwrite">
            <annotation name="org.freedesktop.Accounts.DefaultValue" value="-1.0"/>
        </property>

        <!-- Muted is all sound, SilentMode is only non-user-initiated sounds -->
        <property name="Muted" type="b" access="readwrite">
            <annotation name="org.freedesktop.Accounts.DefaultValue" value="false"/>
        </property>

	<property name="LastRunningPlayer" type="s" access="readwrite">
             <annotation name="org.freedesktop.Accounts.DefaultValue.String" 
                value=""/>
        </property>

    </interface>
</node>