The package contains the graphical changes (retextures, skybox, fog and contrasts changes) and the IA changes (Adaptive difficulty removed, enemies aren't bullet sponges anymore and their strenght is now based on their equipment and levels, etc...).

This is an alternate version of the mod Noir York City for Max Payne 1 : It contains ONLY the skybox (= The dark sky, the distant buildings) as well as the modded Contrast & Fog.
These files can also be useful for modders: To create custom sky textures.