This is a file that'll fix skin shaders. There are fixes for the hand texture, map height, red and green ecologist suits, DU/DV map, and others.
Extract the files in your S.T.A.L.K.E.R. directory which for retail buyers should be located in C:/Program files/THQ/S.T.A.L.K.E.R. -Shadow of Chernobyl/Gamedata/ and for Steam users it should be located in C:Program files/Steam/SteamApps/Common/Stalker shadow of Chernobyl/gamedata