Thanks for providing the project with the template file.
I have checked your template file i.e.., "cd_exceptions_Jan 28 2008.xls", it indeed has BIFF7 records in it. For confirmation you may open the file into MS Excel 2003 and Click File|Save As... and check the save as type combo box.
Currently, Aspose.Cells only supports BIFF8 or greater format (Excel97 - Excel2007). Where you get this file, if you get it from some third party venders, you may ask to provide it in BIFF8 format. If you want to stick with file format BIFF7, you have to convert it to Excel97 - Excel2003 format yourself first. The procedure is simple:
Open your file in MS Excel (Excel97 - Excel2003) and Save the file As "Microsoft Excel Workbook" and then you may utilize Aspose.Cells to use the file.