Help! Needed for work. AppleScript to convert XLS to XLSX

Thanks for your help.
I need an Applescript/embedded script to convert an Excel file from XLS to XLSX when saved in a folder which is monitored by Hazel. The database that creates this file can only export to XLS.
Thanks again.
I need an Applescript/embedded script to convert an Excel file from XLS to XLSX when saved in a folder which is monitored by Hazel. The database that creates this file can only export to XLS.
Thanks again.