title: Visual Studio Installer not overwriting files in target application directory
body: <p>I have a Visual Studio 2008 solution that contains several projects.
  Most projects in this solution write a .dll when built.
  My installer project in this solution copies these .dlls to a target application directory.</p>
  
  <p>My uninstaller for this solution does not remove these .dlls, even though it should.</p>
  
  <p>My installer doesn't overwrite old versions of existing .dlls, which causes my application not to function.</p>
  
  <p>If I delete the existing .dlls prior to install, the application works well.</p>
  
  <p>I've monkeyed with many many settings in the solution for these .dlls.  Nothing seems to work.</p>
  
  <p>I've added extra copy actions to the install project, in an attempt to overwrite existing .dlls.  A couple of these extra copy actions can not be deleted, because the delete choice is disabled from the drop-down list when I right-click on them.  Weirdly, the original detected dependencies can be deleted.</p>
  
  <p>Any ideas are most welcome.
  Thanks,
  -Vince</p>