Alright, it's done! The 'Improvement Mod' is now compatible with the Steam AoE3 game.
Remember, when installing the mod for Steam use this path in the installer:
/Steam/steamapps/common/Age of Empires 3/bin/
Now here's the thing, I fear, not sure about it, but I fear that if you start the game with Steam, it could check your files for changes, and when it finds them, it might 'update' your game to the original version, so I recommend starting the game from inside the 'bin' folder using 'age3y.exe'. I am not sure about this, I need reports from more people to be sure. I also need to remind you that this mod is for 'Asian Dynasties' ONLY! So when starting from Steam, select TAD.
But, as far as 'working' goes, it works perfect! Tested my self with the help of my good friend Daniel.
Regarding in-game changes. As I told you before, the Japanese can now ally with the U.S.A. through the Consulate and get 4 U.S. units and some awesome techs. This alliance replaced the 'Japanese Isolation' one.
Now don't be sad, one of the units from the 'Japanese Isolation' was added as a native in place of the Sohei, and the Shinobi is now available in the Japanese Home City, so nothing has been lost.
Also, more changes have been done on the European and U.S. Priest. And let's not forget the balance changes some people requested here on the blog.
And that's all for now. Let the problem and bug reporting begin!