SaveType.Excel does not work

I've recently downloaded the newest version to test against our solution. The following opens in my browser - can you explain that?

Excel excel1 = new Excel();

Cell cell = excel1.Worksheets[0].Cells["A1"];

cell.PutValue("First cell");

excel1.Save("testone", FileFormatType.Excel2003, SaveType.OpenInExcel, Response);

I use VS 2005 and IE6.0 on XP sp2

Please change your code to:

excel1.Save("testone.xls", FileFormatType.Excel2003, SaveType.OpenInExcel, Response);