I believe I have put together a solution that will work for me as a result of your excellent help and the example I found here on Ron de Bruin's site:
http://www.rondebruin.nl/saveas.htm

Rather than offer the user the option of saving as .xls or .xlsm, I chose to restrict the save to .xls.

Clicking on Save or SaveAs brings up a userform that directs the save procedure beyond that point.

Thanks again for your assistance.

Ron