title: Event when dragging over valid drop target outside of app?
body: <p>I have a very simple method that writes a file locally but I only want to fire it if the user looks like they are going to drop outside of the app because firing it every time they start dragging would result in lots of unnecessary files being written.</p>
  
  <p>So my question is: if a user drags something within the app outside of the app, is it possible to detect when they drag over a valid drop target (e.g. the desktop or windows explorer)? </p>
  
  <p>EDIT: At a more general level, my question is: how can I respond to mouse/drag events that occur <strong>outside</strong> of my app?</p>