title: Request.Files is empty when uploading with jQuery File Upload with Internet Explore 6/9
body: <p>Whenever I try to upload using Blueimp  jQuery File Upload on  Internet Explore 6/9, ASP.NET cannot find the files in the request. I have basic code which looks like</p>
  
  <pre><code>[HttpPost]
  public JsonResult Images()
  {
      HttpPostedFileBase file = Request.Files[0] as HttpPostedFileBase;
  }
  </code></pre>
  
  <p>My jQuery looks like:</p>
  
  <pre><code>$('#fileupload').fileupload({
                      //forceIframeTransport: true,
                      //contentType: 'multipart/form-data',
                      //replaceFileInput: false,
                      //contentType: 'text/plain',
                      //dataType: 'text/plain',
                      url: '@Url.Action("Images", "Upload")',
                      //autoUpload: true,
                      done: function (e, data) {
                          $('.file_result').html('');
                          $('.file_result').append(data.result.text + "&lt;br&gt;");
                      }
                  });
  </code></pre>
  
  <p>The first part is when it's working and the second is when I'm using IE7-9.
  <img src="https://i.stack.imgur.com/kaZYN.png" alt="enter image description here"></p>