Index: wp-admin/admin.php
===================================================================
--- wp-admin/admin.php	(revision 5795)
+++ wp-admin/admin.php	(working copy)
@@ -76,11 +76,13 @@
 	if ( validate_file($importer) ) {
 		wp_die(__('Invalid importer.'));
 	}
+	
+	$importer_path = apply_filters( 'importer_path', ABSPATH . "wp-admin/import/$importer.php" );
 
-	if (! file_exists(ABSPATH . "wp-admin/import/$importer.php"))
+	if (! file_exists($importer_path))
 		wp_die(__('Cannot load importer.'));
 
-	include(ABSPATH . "wp-admin/import/$importer.php");
+	require_once($importer_path);
 
 	$parent_file = 'edit.php';
 	$submenu_file = 'import.php';