XLS Leave feedback On this page FileType.XLS field See Also FileType.XLS field Excel Spreadsheet (.xls) represents Excel Binary File Format. Such files can be created by Microsoft Excel as well as other similar spreadsheet programs such as OpenOffice Calc or Apple Numbers. Learn more about this file format here. public static readonly FileType XLS; See Also class FileType namespace GroupDocs.Signature.Domain assembly GroupDocs.Signature Was this page helpful? Not really Yes, thanks Any additional feedback you'd like to share with us? Skip Send Please tell us how we can improve this page. Skip Send Thank you for your feedback! We value your opinion. Your feedback will help us improve our documentation.