title: Datatables Export to CSV and Excel File Extension Missing
body: <p>I followed the following <a href="https://www.datatables.net/extensions/buttons/examples/initialisation/export.html" rel="nofollow">example</a>. However, whenever I click on the CSV and Excel file export button I only get a file without its extension. It would be cumbersome for my final users to manually add the file extension so I was wondering if there is something that needs to be fixed. I have already read the the source code in the example but I have not found anything different. The source code to create the table is pretty straightforward.</p>
  
  <pre><code>$('#example').DataTable( {
      dom: 'Bfrtip',
      buttons: [
          'copy', 'csv', 'excel', 'pdf', 'print'
      ]
  } );
  </code></pre>
  
  <p>Thank you very much for your help.</p>