Using 3ds max, I'm just playing with a model, which I found from a game. I'm not familiar with 3ds max, Hopes the question is not so silly.
It has three types of maps, with 'D', 'N', 'S' suffix. So I guess D for diffuse, N for normal, and S for specular.
The first two seems right. but what's the type of the third one? It doesn't seem to be a specular map, but seems to be the 'metal' parts, so I tried using mix map but the result is also different from in-game result.
The following are the three maps, and my rendered result with in-game result. I think the biggest diffrence - the metallic small decorations, should be what the third map does.