To back this up, Spiderweb's original Exile series still works perfectly well on modern Windows machines. I dug up my disk for Blades of Exile a while back and spent some time playing it on my Linux machine without anything other than some very minor graphical glitches. The Mac versions haven't been playable without an emulator for a very long time. And in this case, we're talking about the most recent iteration of SW's engine (they seem to remake Exile with a more modern engine and refreshed graphics every so often; the current Avernum 2 is the second remake of Exile II). Software platform vendors should really make an effort to maintain backwards compatibility for at least a few years -- especially when the platform is so centrally controlled.