title: How to reopen a file immediately after it closes via my C# application
body: <p>I ran out of ideas and couldn't find any reference about it so here I go...
  I need to keep a secondary application wich is not related to my c# project always running in background. So if this secondary application crashes or someone else close it manually it will automatically re launch again via my c# app.</p>
  
  <p>I have no clue of how to accomplish this one, I mean checking if this application closes by something external to my c# app. </p>
  
  <p>Any help would be greatly appreciated.
  Thanks in advance.</p>