title: Launch macOS app from FinderSync extension
body: <p>I wrote an app that implements FinderSync extension. </p>
  
  <p>Everything works fine, I can "communicate" by sending notifications through <code>DistributedNotificationCenter</code> from extension to main app. But obviously it works if the main app is running only.</p>
  
  <p>Is there any mechanism to open terminated app and pass parameters?</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>The idea is to implement simple image processing app. I want to run the main app (containing execution code and GUI) from Finder-Sync extension. </p>
  
  <p>To be more specific I implemented <code>func menu(for menu: FIMenuKind) -&gt; NSMenu?</code> of <code>FIFinderSyncProtocol</code> and I want to run/open main app when user right-clicks the menu item and selects operation I added into menu.</p>