title: VSIXInstaller.exe exit code documentation
body: <p>When launching VSIXInstaller.exe from our application, we're trying to use the ExitCode property on the Process object to determine if the package was successfully installed, but we've found that the exit code is 0 even if the user clicks the 'Cancel' button on the dialog. </p>
  
  <p>I expected that there would be some other code returned in that scenario, similar to what msiexec does. </p>
  
  <p>However, when I searched for documentation about the exit codes VSIXInstaller uses, I don't find anything. I'm looking for something <a href="http://msdn.microsoft.com/en-us/library/aa376931%28v=vs.85%29.aspx" rel="noreferrer">along these lines</a>.</p>