Now Im trying to save the workbook as an excel workbook but it saves the file as an CSV. I want a .xlsx So I did this: ..... ensure # Save the workbook and close # filename is 'C:\Ruby\Lab\test.csv' excel.activeworkbook.SaveAs(filename.split(".").first+".xlsx") excel.activeworkbook.close(false) # Quit Excel excel.quit end This saves the file without problem but I cant open it because the file format or the file extension is not valid. How should I save it?? Any suggestions? Br cristian -- Posted via http://www.ruby-forum.com/.