title: While renaming a pch file at Debug folder it shows cl.exe is using it
body: <p>I have a pch file at the debug directory of my application's visual studio project. 
  But it shows in use by cl.exe. I don't have any visual studio IDE open.
  I can't think which agent can keep cl.exe alive to keep a file in use.</p>
  
  <p>I need help if anyone can guess the problem.</p>
  
  <p><a href="https://i.stack.imgur.com/pw8dl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pw8dl.png" alt="enter image description here"></a></p>