This mod is basically the Alexander addon on the BI.exe, it is a bit customized to fit the features in the BI.exe, has some new features, but this will expand in more versions, like adding more/enhancing mercenary units and removing factional colors from them as they can be used by anyone.
This is small addon, which is adding Persian textures for the Alexander on BI mod. Put all files to the models_unit\textures folder in this mod and replace all.