I just want to be able to create my program ... programmatically. So I went to `File > New > Project` and selected `Cocoa Application`, and ensured that "Use Storyboards" was not checked on the next step of the wizard. The project that it gave me has a `MainMenu.xib` file in it. I don't know what `.xib` files are, but I know that they mess with my program in ways I don't understand.

So how do I create a new Cocoa Application without any of these "storyboard" or "interface builder" things? What is the minimal, purely programmatic, program which launches one empty window?