Saves a specified Workbook as a OOXML format (Excel 2007 or later) .xlsx or BIFF8 format (Excel 97 or later) .xls file.
Workbookobject representing the workbook to save.
fileNameSpecifies a complete path and file name for the Workbook. ExcelWriter will save the file to this location. If a file with the same name exists, it will be overwritten by the new Excel file.
System.ExceptionIf there is a problem creating, opening, or writing to the file specified, or reading from the workbook object.
System.ArgumentExceptionIf the extension of the filename given is invalid for the given workbook. For example, a file created with Excel 2007, that has macros must be saved with the .xlsm extension