These textures with a lil' "_e" are environment maps better known as *Cube Maps". It uses 6 images, Right, Left, Front, Back, Up, Down, to simulate reflection on meshes. It makes cool effects, and you can find some crazy Cube Maps on the net, even those from other games may work ( i uses Skyrim ones, and have some home made too) But it's not the specular here,, there is 2 ways to had specular maps in Fallout, First yiou use the normal map alpha channel( white=Shiny, black=No Shine, grey levels= shine levels) Or the second way is, to delete the alpha from the normal map and you let the nimaterial property from the mesh making it. You can controle it levels in Nifskope. Note the second way is always overriden if you have a normal map with alpha channel. Last thing... cubemaps go along with another texture that got "EM" Or "em" or "m" at the end (Ex: armor_em.dds) these are environment mask (not map) it works exactly like the alpha from the normal (white=Shine, Black=Flat). To have it working you have to open the Mesh in Nifskope thgen go to "BSSshaderPPLightingProperty" and in the Shader flags enable "Environment Mapping" Then under "BSShaderPPLightingProperty" open "BSShaderTexture Set" and there you'll see "texture" word on the left, and if you stay with the mouse arrow on it, you'll have an help, explainig what lines to put your textures here. Don't forget to allways put "textures\" at the beginning of the path of each lines , as an exemple if you put "armor\helmet.dds" the game will not find your textures and you'll have Blue or black meshes ingame. The right setting is for exemple "textures\armor\helmet.dds" Cubemaps are also affected by the fake 3D effect of the Normal map, (the reflection follow the relief emboss, holes etc...), wich can make great effects.