title: Get the icon for a given extension
body: <p>I know i can extract a file's icon using</p>
  
  <pre><code>using (System.Drawing.Icon sysicon = System.Drawing.Icon.ExtractAssociatedIcon(filePath))
  {
      icon = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(
          sysicon.Handle,
          System.Windows.Int32Rect.Empty,
          System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
  }
  </code></pre>
  
  <p>But how can I, with no file, get the icon for a given extension?</p>