title: SWT OleClientSite: How to load XML file in Excel?
body: <p>I have an Excel file in OfficeML format, MyData.xls. Since I upgraded to Office 2007 from Office 2003 I get a warning message saying that the file content does not match the file extension. It seems that OfficeML now must have the extension 'xml'.</p>
  
  <p>In my application I use OleClientSite to display the file in an OleFrame object. If I change the file extension to 'xml' then Excel is not started. If I leave the extension as 'xsl' then I get the above warning message.</p>
  
  <p>How can I force the file with the 'xml' extension to be opened in the OleFrame using Excel?  </p>