title: OpenFileDialog xml Filter allowing .htm shortcuts
body: <p>I've filedialog in winforms.
  It is set to read only .xml files.</p>
  
  <pre><code>ofd.DefaultExt="xml";
  ofd.Filter="XML Files|*.xml";
  </code></pre>
  
  <p>but when I run it is allowing to upload .htm file shortcut. whereas it should not show .htm file at all.</p>