I was meaning that if the username that opened the workbook was JO15765 then I want to append the id 45678 to the end of the workbook name. There have been ID's assigned to all usernames, and it's a way of monitoring who is opening what workbook. So in the instance that someone finds the log file, they won't know whose ID is whose, but if we appended usernames then that would be very easily recognizable.