title: tkinter TclError: error reading bitmap file
body: <p>I am trying to set an application icon (python3 / tkinter) like this:</p>
  
  <pre><code>Interface()
  root.title("Quicklist Editor")
  root.iconbitmap('@/home/jacob/.icons/qle_icon.ico')
  root.resizable(0, 0)
  root.mainloop()
  </code></pre>
  
  <p>no matter what I do, I keep getting an error message (Idle), saying:</p>
  
  <pre><code>return self.tk.call('wm', 'iconbitmap', self._w, bitmap)
  _tkinter.TclError: error reading bitmap file "/home/jacob/.icons/qle_icon.ico"
  </code></pre>
  
  <p>What am I doing wrong?</p>