Here's the code where we're trying to open the workbook. This code worked before we upgraded our version of Cells. The file can be saved and opened later just fine. And, what is even more odd is when the dialogue box pops up to Open, Save or Cancel, if you click Open, Excel opens and you get an error " 'C\TEMP\Temporary Internet Files\COntenr.IE5\64EXJKT8\CVREport_11706_1034.xls' count not be found. Check the spelling of the file nane and verify that the file location is correct." If you click OK on this but don't close excel then try to do the open again, it works.
Workbook workbook = ExportService.Service.DetailReportExport(creative, dataSource, thumbnailFile);
String excelFile = "CVReport_" + DateTime.Now.ToString("MMddyy_HHmm") + ".xls";
workbook.Save(excelFile, FileFormatType.Default, SaveType.OpenInExcel, Response);