Just some other stuff I got working last night, I was able to swap the upper and lower body textures with other skin textures in the game. I made the female skin zombified. I may have gotten too carried away there, but at least the Tiefling looked pretty cool.
Also, I found the file for those black foot wrapping for when you don't have shoes on, in the directory Skinfeet, it's a file called 'F_Feet_Wraps_Orig_01_C.wtex.' Just take a copy of the same file from the previous modifications, rename it and place it in a folder named Skinfeet in your \Localdata\texture_library\costumes\Avatars folder. This removes the foot wrappings, but I'm certain it affects other foot armors in the game. As in, my low level clerics boots wouldn't appear.
Edit* Your character does have toes. They're drawn on, but they're there.
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Some other stuff: The female proportion sliders (breast size, chest depth, etc...) are found in the data.hogg under 'data\animation_library\Nw_Female_02\Scale.' I don't know anything about the files themselves, but they're extension .atrk. If anyone knows how to edit them, replacing the slider settings might be as simple as creating a 'animation_library\Nw_Female_02\Scale' directory similar to the texture_library in the localdata directory of the game directory.
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Searching around the internet, it seems the .mset and .atrk files are unable to be or are difficult to mod.
Because the file architecture used in cryptic's STO is so similar to NW, I attempted to apply the STO mods that exist.
What I learned: Don't use STO's animation mods; they crash the game upon trying to render anything that the mod animates (e.g. boobs). STO's body textures can apply to NW, it just doesn't look like anything in game. STO's breast slider mod changes... something. It makes all races the same size and proportion (even dwarf and halfling) and disables any of the actions the sliders during character creation perform. My guess is it just gives every female the same size and proportions of the female in STO.