title: Where is MainWindow.xib in new Xcode project?
body: <p>I started a new project in Xcode 4 using the TabBar template.
  I noticed that there was no <code>MainWindow.xib</code> file in the project.</p>
  
  <ul>
  <li>Did Apple get rid of this file? </li>
  <li>How can I access the Mainwindow without this file?</li>
  </ul>