In that case why this is needed? Because Skyrim stores each unique NPC face in a pre-generated nif file. There are already mods that create a framework for this: By default for non-beast races there is only one texture used by males and one by females (Argonians and Khajit have unique textures). This tool was created to allow you to easily use different meshes/textures per race on Skyrim's playable races.
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