We have an JSP page that export the data to Excel by setting the response (ie Content-Type: Application/vnd.ms-excel). It works fine with Excel 97, but when we upgrade to Excel2003, the document is downloaded and opened fine. However when I want to save as, it thinks it is a HTML document and tries to save it as an web page document. I understand that from there I can change the file type to .xls and it will work fine. This extra step is very annoying and I am wondering if Excel still think it is a HTML document since it is downloaded from an jsp. We want to be able to save the document as an true excel document.