One of the many drop-offs in windows is the association of icons with programs - most programs have their icons built-in, so given the program you can find the icons, but the reverse isn't so easy.
It's similar to the Ikea flat-pack assembly instruction leaflet. The author knew what he wanted you to do, and wrote it in words of one syllable, possibly in Swedish. Then the editor came along and translated that into pictures, because not many people can read, but everyone can understand pictures. But what could this mean? It's only after you've hit your thumb that you can work out what he meant. If he'd used words, you'd have known straight away.