title: Instantiate File object in Microsoft Edge
body: <p>I'm trying to create an image file from a blob-object using the <a href="http://caniuse.com/#feat=fileapi" rel="noreferrer">File API</a> and then add it to a form to be sent via XHR. Works like a charm in chrome, but crashes the app in Microsoft Edge.</p>
  
  <pre><code>let file = new File([blobContent], "image.png");
  
  let form = new FormData();
  form.append("file", file);
  </code></pre>
  
  <p>Are there any alternatives to the File API or workarounds to attach a file to the form? If I just add the blob to the form it's not recognized as an image.</p>
  
  <p>Thanks!</p>