+ $menu_file = $submenu[$item[2]][0][2];
+ if ( false !== $pos = strpos($menu_file, '?') )
+ $menu_file = substr($menu_file, 0, $pos);
+ if ( ( ('index.php' != $submenu[$item[2]][0][2]) && file_exists(WP_PLUGIN_DIR . "/$menu_file") ) || !empty($menu_hook)) {