re: help on the file type

String file_ext = "rtf";

response.setContentType("application/detail."+file_ext);
response.setHeader("Content-Disposition",
"attachment;filename=detail."+file_ext);

response.getWriter().write(viewBean.getDownloadFil eContent());
In save as file dialog box, it triggers the
file name: detail.rtf
file type: html document

Can it be triggered as rich text document in the dialog box

How can I do that?