rider faces

I have realised that the STA_tga_skin in the .cdb file is not there anymore.
So now my question is how can I change the cyclist faces or place costume faces like in previous versions.
In DYN_cyclist the fkIDtga_skin column is working I see numbers on the black riders (16) like Reza, Behane,...
So this column is working, but how? And where are the skin textures placed?
So now my question is how can I change the cyclist faces or place costume faces like in previous versions.
In DYN_cyclist the fkIDtga_skin column is working I see numbers on the black riders (16) like Reza, Behane,...
So this column is working, but how? And where are the skin textures placed?