We should add a new rule to the forum signup process: "Don't pester the game creators for source code".
That Santa Walking info is interesting. It'd be nice to figure that one out. There's only one place where those Windows API functions are called. It seems to be from some standard C library code. That code is only called from 3 places. I haven't noticed anything too interesting looking so far though, other than one of those places being when saving games. I can't think of any reason to get the time when saving games, particularly since I didn't see any saved game times listed in any of the dialog boxes.
I'd been tempted to take up Dan on that offer a while back, but I suspected the page was somewhat old and the challenge game unlikely to happen. I always assumed that challenge was regarding the cheats, but I'm not so sure anymore. We know there are 4 cheats, and we've found 4 text strings that activate all of them, but we don't really know what the 4th one is officially. We just found a somewhat random string using a brute force dictionary attack for that one. It would have been nice to know what the "official" 4th string was though. The first 3 are posted all over the net.