IE open excel file directly but not save as

[Emi Lu]

Hello ,

I know its not really struts question. But maybe someone knows the answer.
IE cannot open an excel file directly (IE8,9)

 res.reset();
 res.setHeader("Cache-Control", "private, must-revalidate");
 res.setHeader("Pragma","private");
 res.setContentType("application/vnd.ms-excel");
 res.setHeader("Content-Disposition", "inline;filename=\""+ "fn.xls" + 
"\";");
 res.setContentLength(fileData.length);
 res.setHeader("Content-Transfer-Encoding", "binary");

If I save as a file, open it, excel shows:

 "Office File Validation detected a problem while trying to open this 
file. Opening it may be dangerous"

Then I have to click "open" to open it.

Does someone know how to open excel file directly but not have to save 
as under IE please?

thanks a lot!
Emi

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