title: Run windows form before project installation
body: <p>I want to run a windows form before the setup wizard for my project installation starts.     </p>
  
  <p>I can use a custom action and specify the windows form at the install stage.</p>
  
  <p>But it runs after 2/3's of the wizard steps have been completed and installation continues.</p>
  
  <p>I want to run my form first and then project installation starts.</p>