Adding Cube Maps to .nif Mesh (causing crashes)

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How do you add cube maps to a mesh file using NifSkope?

I change the shader type to Environment map, add appropriate shader flags, adjust environment map scale, add .dds cubemap and environment mask files to texture sets. When I load the game, it crashes. What am I missing?

[myuhinny]

http://wiki.tesnexus.com/index.php/Creating_cubemaps_for_Skyrim