title: the action can't be completed because the folder or a file in it is open in another program
body: <p>When deleting a folder that contains a file that is in use, it is common to see the following Windows 7 message, </p>
  
  <blockquote>
    <p>"The action can't be completed because the folder or a file in it is open in another program."</p>
  </blockquote>
  
  <p>I commonly have 10-20 programs open, 30-40 folders open, etc. In short, I have many executables running and many windows explorers open. </p>
  
  <p>Does anyone know a simple trick to determine <em>which</em> program is using the file?
  Does anyone know a simple trick to determine <em>which</em> file is blocking the delete operation?</p>
  
  <p>This information would be highly useful to display in the Windows 7 'folder in use' dialog, but it is missing.</p>
  
  <p>Consequently I have to close many of my open applications and folders to complete the delete operation. This is annoying because I have to re-open them after deleting them.</p>