title: I can't save a file in Visual Studio Code which is checked out from TFS
body: <p>I want to edit a file that's checked in to TFS using Visual Studio Code, but even though I've checked it out (from within Visual Studio) I get an error when I try to save it: 
  "Failed to save 'myfile.cfc': A system error occured (EPERM: operation not permitted, open 'd:...\myfile.cfc')".
  I've tried different file types and ensured that the Read-only attribute is off on the file, but I still can't save anything. (I can do a Save-As and edit &amp; save that file all I want, but of course I'm not going to do that).</p>
  
  <p>Does anyone know what I can do?</p>