SQL Reporting :: How To Export RDLC Report To Excel 2007

I have designed a report in RDLC. I am using Visual Studio 2008 and C#. Below is my code to export the report in excel. It always export the report to xls format which is Excel 2003. Excel 2003 has limited rows upto 65000. When i get rows more than 65000 for example 90000 then the export fails. Excel 2007 has power to handle more than 1000000 rows. I want to export the RDLC report to Excel 2007 to overcome the issue. how by modifying the following code i can export the report to Excel 2007.

byte[] bytes = null;
bytes = viewer.LocalReport.Render("Excel", null, out mimeType, out encoding, out extension, out streamIds, out warnings);
Response.Buffer = true;
Response.Clear();
Response.ContentType = mimeType;
Response.AddHeader("content-disposition", "attachment; filename=Rendered Services." + extension);
Response.BinaryWrite(bytes);
Response.Flush();