How to disable Format Warning when displaying JSP in Excel under MS-Office

We have an application running in WebSphere 6.0 container, the application displays jsp data in Excel, it had no problem before MS-Office 2007 was install. However, after MS-Office 2007 is used, following format warning dialog box is always displayed:
The file you are trying to open, Requests[1].xls, is in a different format than specified by the file extension.
Verify that the file is not corrupted and is from a trusted source before opening the file.
The user has to click the "Yes" button before the Excel report can be successfully displayed. This is not acceptable by our production users, and I need your helps to get rid of this dialog box.
The application uses struts. The Action class retrieves data from database and the data is forward to the result jsp
in an data object set in an attribute of the session's Request object. The Action class also set the display info, such as the contentType,etc., in session's Response object (please see below for details).
The result jsp retrieves data from the data object and display in Excel according to the display info provided in the
session response object.
To eliminate any possible problem that may be caused by the data, I have simplified the result jsp by removing original
codes (such as data object forwarded from Action, and Tag Library, etc.), and just hardcoded few data for displaying in Excel, however, the same format warning box still always shows up.
My Action class set display info as below:
response.setContentType("application/vnd.ms-excel");
response.setHeader("Expires", "0");
response.setHeader("Cache-Control","must-revalidate, post-check=0, pre-check=0");
response.setHeader("Pragma", "public");
response.setHeader("content-disposition","attachment; filename=Requests.xls");
My simplified result jsp is listed below:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>

<TITLE></TITLE>
</HEAD>
<BODY>
<TABLE border="1">
     <TBODY>
     <TR>
     <td><p align='left'>myData1</p></td>
     <td><p align='left'>myData2</p></td>
     <td><p align='left'>myData3</p></td>
     <td><p align='left'>myData4</p></td>
     </TR>
     </TBODY>
</TABLE>
</BODY>
</HTML>
So, I reduced the result jsp to contain only few hardcoded data, but the format warning always shows up. Is it caused by inconsistency between the MS-Office 2007 browser and the JSP engine in WebSphere 6.0 Web container? Need your help to resolve this problem.
Thanks in advance.

That's the caveat of fooling your webbrowser and Excel with a plain HTML page along an Excel content-type and Excel extension.
Don't do that. That's plain stupid. Provide a real binary Excel file. You can create one using Apache POI HSSF or Andy Khan's JExcelAPI. Alternatively -and more recommended in case of large reports-, just use the CSV format. It's easy to create a CSV file in 20 lines of code and Excel perfectly understands CSV formats. Don't forget to change content-type to CSV.

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