OK, environment mapping is very simple to add so long as you have already added the bump and specular maps for your skin, it won't work without these files. In the viewer in the material section just slide the environment slider right or left to adjust the effect. This alters the bumpmat.txt file, which now has a fourth row of numbers. The key one is the bottom right number, 0.300 in the case below. The closer this number is to 1.000 the more environment mapping you will see. A setting of 1.000 looks chrome-like.
0.275,0.275,0.280,1.000,Ambient
0.680,0.680,0.670,1.000,Diffuse
0.000,0.000,0.000,1.000,Emissive
1.000,1.000,1.000,0.300,Specular
10.000,Power