title: iOS 3.x support for [UIImage imageNamed:]
body: <p>In my application I'm loading images like <code>[UIImage imageNamed:@"fileName"]</code> (without extension) which works perfect with iOS 4.x devices. To support the retina display every image is available in two versions (with the "@2x").</p>
  
  <p>Back on iOS 3.x devices images are not loaded, which has to do with the missing file extension.</p>
  
  <p>Does it work if images loaded with the extension (<code>[UIImage imageNamed:@"fileName.png"]</code>) and also support the retina display? In this case is the image "fileName@2x.png" loaded on retina devices or "fileName.png"?</p>
  
  <p>The problem is, that I don't have a device running iOS 3.x for testing.</p>