Objects as seen in the game are essentially combinations of shape (the mesh file) and textures (dds files). Retexturing an object involves changing the textures of an object but not the shape.

There are several utilities for this, Texture Replacer which is specialized on retexturing (and is capable of changing the textures of a whole tile-set at one swoop), NifSkope which is an allround-tool for modifying NIF-files on a low-level scale (including but by far not restricted to retexturing) and NIBlE which implements many of NifSkope's functions in a simpler interface.

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