title: Setup/Deployment project: Prevent modified files from being removed when uninstalling
body: <p>I have a setup project. If the user modifies one of the installed files and then un-installs the application, I'd like the file to NOT get deleted by the uninstall (so that when the user re-installs later, the modified file is used rather than the default one that the installer would normally use). Is this at all possible?</p>
  
  <p>Note: Files which have not been edited should be applicable for upgrades/removal.</p>