This file is indexed.

/usr/share/squirrelmail/plugins/compatibility/index.php is in squirrelmail-compatibility 2.0.16-1.

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

The actual contents of the file can be viewed below.

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<?php

/**
 * index.php
 *
 * Copyright (c) 1999-2009 The SquirrelMail Project Team
 * Licensed under the GNU GPL. For full terms see the file COPYING.
 *
 * This file simply takes any attempt to view source files and sends those
 * people to the login screen. At this point no attempt is made to see if
 * the person is logged or not.
 *
 * $Id: index.php,v 1.4 2001/12/23 07:42:39 thomppj Exp $
 */

header("Location:../index.php");

/* pretty impressive huh? */