MS excel generated files

It looks like XlsIO cannot be used to open and read files created in MS Excel, because I get a "cannot open file storage" error when I try to do this...
Here is the line of code that I use:
ExcelEngine excelEngine = new ExcelEngine();
IApplication application = excelEngine.Excel;
IWorkbook workbook = excelEngine.Excel.Workbooks.Open(Server.MapPath("\\XXXXX.xls"));
IWorksheet sheet =workbook.Worksheets[0];
Response.Write(sheet.Range["A1"].Text);
Am I going wrong somewhere? Please help.

Hi Moihlobudi,

Thank you for your interest in Syncfusion products.

You have already created a direct trac incident regarding this issue. Could you please follow up direct trac incident?

Regards,
G.Yavana