title: "File couldn't be downloaded" in Internet Explorer with ASP.NET MVC
body: <p>So I'm returning a <code>FileContentResult</code> from an action like this:</p>
  
  <pre><code>return File(pck.GetAsByteArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "MyExcelFile.xlsx");
  </code></pre>
  
  <p>When clicking "Open" in IE (I'm using IE9, version 9.0.8112.16421), it says "File couldn't be downloaded" and the user is presented with a 'Retry' button.  If they click Retry, it works fine.  If they click Save, it works fine.  In Firefox, it works fine.</p>
  
  <p>How can I allow the user to open the file when the click Open the first time?</p>