Not sure if I am missing something.
I copied the .iff files to my MLB2K12 folder in steamapps
loaded up Roster Editor 1.1
clicked import and loaded Roster.ROS from appdata
went to uniforms > Import > ard_colorlist.txt
window popps up and says "uniform(s) information imported
loaded the game, no change to uniforms. Is there something that was missed in the instructions?