Selenium : Apache POI ,xls vs xlsx

xls vs xlsx(http://poi.apache.org/spreadsheet/quick-guide.html#NewWorkbook)

// Use a file

Workbook wb = WorkbookFactory.create(new File("MyExcel.xls"));

// Use an InputStream, needs more memory

Workbook wb = WorkbookFactory.create(new FileInputStream("MyExcel.xlsx"));