I have compared DrByte's "v1.7" ordersExport.php file with the original v1.6 copy and with my v2.1 orders_export.php, and his updates consisted of deleting the $mat_stack_sql_error lines which were not used for anything, and converting the mysql function lines to $db processing, both of which I had already done. (My $db processing is in a different arrangement than DrByte's, partly due to additional functionality, but I think they are compatible.)

Therefore, I think the v2.1 attachment above should work with the latest versions of Zen Cart.