Save XLS to XLSX when you change the Excel version from older to newer. The Excel Converter easily converts xls into xlsx format. Its fully compatible with Windows 8 operating system. With the help of this application user can open unlimited xls files into xlsx format. Software has both option such as convert single xls file or multiple file into upgraded version. You can add single file and folder for conversion. Before conversion you can check the entire files and select/deselect for conversion. You can choose a path for saved converted data as well as software. Free demo version helpful to view and open a single file into higher version. User can export various excel file for conversion, software create path where the original file located. It gives you 100% positive result. Full version is available only 49 USD. More information: www.bkfrepairtool.com/products/save-xls-to-xlsx