OSNews

"One of the most frequently used Cocoa classes is NSImage which, as the name suggests, is all about displaying and manipulating image data. The imageNamed: method of this class retrieves an image reference for you - provided that you know the name of the image you're after. Many of the images that can be retrieved via the imageNamed: method have well documented names, but there's a lot of stuff in there that's not well-known. It's those images - including some for Windows - that I'll be digging into here. I shall also give you source code to a little utility that uses an entirely different mechanism to retrieve images used by OS X."