dll are windows only, right? That makes Gandalfs proposal a lot more likely. Nothing will be developed unless it is first made to work under linux. The Windows version is a bonus to all those people who happen to have a windows computer besides their linux
In other words, JK develops the game in linux, and tries to make it work under windows and Mac OSX as well. It usually does. He is fascinated with operating systems (or was, when development of dom-ppp begun).