If you want to do simple tweaks to AI leader preferences and such, it's in ...\Assets\XML\Civilizations, file is CIV4LeaderHeadInfos.XML
If you're actually interested in C++ programming for AI behavior, you should check out the BetterAI forum, in the Projects and Mod development forums. The better AI project is being run by Dresden and Jdog5000, probably the foremost CIV AI experts in the world since Blake became a buddhist monk.
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