Thanks a lot. I have to ask some more:
I found the file in Programsx86, Steam, Steamapps, workshop, content, 32470, 1125571106, Data, XML. I guess it's our guy.
I got tree different sets of difficulty levels: Default, Infrastructure, and Skynet.
Since Hard_Skynet is the one giving the AI a 4.0 multiplier in cash, I guess that's the part I have to edit, right?
Just out of curiosity, can I ask what the other set, Infrastructure, represents?