I used to play this as a kid on my dad's computer, and that's already a good reason to see it preserved forever by GOG, but that's not the only one. This game is a gem: it's not revolutionary in terms of mechanics, but the worldbuilding and the factions are really flashed out and interesting. The graphics are, to this day, lovley to look at, with lots of details and nice animations on the buildings, troops, maps and interface. It's not a revolutionary RTS like some of the big players, but it can be a surprising game if you give it some time.