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<?php
function ccd_cpt_archive_menu_filter( $items, $menu, $args ) {
	foreach ( $items as &$item ) {
		if ( $item->type != 'custom' ) continue;
		if (  get_query_var( 'post_type' ) == 'your-cpt-one' && $item->title == 'CPT One' ) {
		$item->classes []= 'your-class';}
		else if (  get_query_var( 'post_type' ) == 'your-cpt-two' && $item->title == 'CPT Two' ) {
		$item->classes []= 'try_current_page_item';}
		else if (  get_query_var( 'post_type' ) == 'your-cpt-three' && $item->title == 'CPT Three' ) {
		$item->classes []= 'or--something-else';}
}
return $items;
}
add_filter( 'wp_get_nav_menu_items', 'ccd_cpt_archive_menu_filter', 10, 3 );
?>