A Pro/Table file is not the same as a Drawing Table (*.tbl) file.
The *.tbl contains information about column and row size as well as repeat region information (filters, sort order, etc).
AFAIK there is no way to export an excel spreadsheet to a table in this format. The only thing I can suggest is to show the worksheet using Insert-->Object-->MS Excel Worksheet. There is an option to bring it in from the file as well. You can resize the "table" in Pro/E by double clicking it and resizing it when the excel windows are active.