title: Excel API Save As Dialog box issue
body: <p>The Excel 2003 API has a GetSaveAsFilename method that pops up the Save As dialog. This takes in various parameters, including the file type (xls, txt, csv,...), something like the following:</p>
  
  <pre>
  GetSaveAsFilename(Missing.Value,
                    <b>"Microsoft Office Excel Workbook (*.xls), *.xls"</b>,
                    1,
                    Missing.Value,
                    Missing.Value);
  </pre>
  
  <p>My issue is, I see only "*.xls" in the dialog File type dropdown. If I skip the file type part (the 2nd parameter), I see just "All Files (*.*)" in it. How can I get to see the normal list that contains all possible file types without creating a long string of all file types and passing it to the method?</p>