title: SaveFileDialog file extension is default Excel version
body: <p>I have the following code that saves the file in the default Excel version ona  given user's machine. </p>
  
  <pre><code>xlWorkBook.SaveAs("c:\\AMORT_data", Excel.XlFileFormat.xlWorkbookDefault, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
  </code></pre>
  
  <p>How can I use the SaveFiledialog (particularly .filter) format use this syntax?  I tried something like this but I get the old "Cannot complicitly convert...." error.  Is it simply a matter of converting the Excel Default to a string or is it more complicated.</p>
  
  <pre><code>saveFileDialog1.Filter = Excel.XlFileFormat.xlWorkbookDefault;
  </code></pre>