title: Windows 2003 server restrict file access permission to allow only one user
body: <p>We have a legacy DOS app running on our Windows 2003 server. It frequently uses one file, and is very sensitive (ie will break) if the file is "touched" by another process. For example, if the file is being scanned by virus-scanning software, or the file is highlighted by mouse click in Windows Explorer.</p>
  
  <p>To make it more stable, I'd like to restrict access to the file using Windows File Permissions. I am going to give access permission to the user starts the DOS app, but to no other users including the SYSTEM account and sys admins. </p>
  
  <p>Will I be able to do it, will my approach work (ie prevent other processes 'touching' the file)?</p>