title: Get a file's icon or thumbnail
body: <p>Is there a way, in OSX SDK, to represent a file in UI, by presenting its icon ?
  In other words, is it possible to access the icon for a specific file, to show it in a NSImageView for example ?</p>
  
  <p>PS: I'm using MonoMac, but Objective-C code will certainly help me too :)</p>
  
  <p>Thanks in advance</p>