im not sure, but i think in order to find the textures you need to extract them. or the texture is already set to the model and you need to change it by directly changing the models texture in a modeling program. im not sure but when ever im doing stuff with models in the geck it doesnt give an option to change the texture, just an option to change the model. so if you change the texture directly in a modeling program that would work, but theres most likely a much easier way than what i just said.
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