title: Export html table to excel file open security warning issue
body: <p>I am using jquery plugin tableExport.jquery.plugin to export html table.
  Plugin is working fine.
  I am using excel 2007.</p>
  
  <p>Issue:
  When I open Exported file it says
  The file you are trying to open is in different format than specified by the file extension.etc</p>
  
  <p>When I say yes it open the file and I can see my content.
  But I don't need to see the warning that is coming up after opening.</p>
  
  <pre><code>// For BIFF .xls files
   var data_type = 'data:application/vnd.ms-excel;filename=exportData.xls;' + base64data;
  
   // For Excel 2007 and above .xlsx files
   // var data_type = 'data:application/vnd.openxmlformats-
   officedocument.spreadsheetml.sheet;filename=exportData.xls;' + base64data;
  </code></pre>
  
  <p>I tried both above methods but It never worked.</p>