Simcity 4 as one of the newer games, was designed using the DBPF format pioneered (presumably) for Simsville, and later used in Both The Sims Online, and Simcity4.
As this format was so successful it was later carried over to the game we now work on, The Sims 2. Luckily much is known about this format and its subfiles by now.
for more information on Simcity4, google for "Simcity 4" or visit some of the flagship fansites of the title like www.Simtropolis.com, www.simcitycentral.net, or www.sc4ever.com as well as the official site at simcity.ea.com . Simtropolis is where 95% of the modding of Simcity4 took place and where the Datgen program was designed.
Sign in to Mod The Sims