@hdd
sorry, but in some tries long time ago, I was getting some major bugs, if I build more cities than the city-limit allows... also in foresight of Civ4, I don't like to spend much more time to Civ3 (maybe one last feature, like complete all city-production, same as the already included complete all foodboxes)
@PenguinKommando
if you get such message, if only means, that your registry-entry doesn't exists or isn't valid (mostly a result of unofficial game-copies or special computer-magazin-versions)... you don't need to run the game by the trainer, just run trainer, then the game manually and simply use the shortcuts