Civ2 got a .txt called rules where you can customize units, wonders tech, in a word everything. For Col its the same and it should by the same for Civ1. Anyway take care, make backups, check from time to time if game still works (you should open it and play a few turns in a developed game) and to change icons and other .jpg or .gif is harder and will make the game crash.
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2nd placed of 1st Ufo2000 Tournament! 
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