Opens a Workbook from an ExcelTemplate object.
object representing the workbook to open.
Workbook that is opened.
If your template file is the new Office Open XML (.xlsx) format, you can pass it into the ExcelApplication.Open
method just as you would a BIFF8 (.xls) Excel file. You will need to remember to give the output file a ".xlsx" extension when you call Save
as ExcelWriter cannot convert .xlsx files to .xls
If there is a problem creating, opening, or writing to the file specified, or reading from the