Can you please help me to convert the flowing file extension to .XLS files, .XLSX,.XLSM,.XLTX,.XLTM,.XLSB,.XLAM
Thanks for your posting and using Aspose.Cells for .NET.
Well, you first need to create a workbook object from your source file e.g xlsm file then you will have to save the workbook object into your desired output file e.g xls.
Please see the following documents for your complete reference.
( http://www.aspose.com/docs/display/cellsnet/Opening+Files )
( http://www.aspose.com/docs/display/cellsnet/Saving+Files )