I got out there (web), long ago, a program that changes the colors of the players and you can select any color we want. It is portable, no installation and works for any mod Age of Empires 3. leave the link: https://mega.co.nz/#!mU4CGAQK!q7ExBRfLxHsmKGOABaf2vJuRMKevH-tuvm9-LIrvhnU
[Edited on 04/20/15 @ 01:32 AM]
Posted on 06/15/16 @ 05:25 AM
This is maybe some years to late to answer. But I found the soloution as a fellow steam member
(Skip this if you know where Age Of Empire is)
In steam libary, you right click on AOE 3 and click properties. After you entered properties you click on "local files" Then you click on "Browse local files" and you'll find the AOE map.
(Now to the modding)
Enter the "bin" map. In his map folder you are supposed to drag in the "data" file from the mod.