I know this is extremely old, but I am also in the same boat. I have document productions with XLS, XLSx, XLSm... in the thousands that I have to convert to PDF before numbering each page. Without a way to print the entire workbook by default, the only option is to open each file individually.
Did you ever get a resolution?
I'm getting errors with the VB DIM statement (It appears the EventClass is not a valid statement).