you need to give a material name for each material you use in max..
If you used "main_body" named material for the body for example,
you need to state this at the skin file..
its like
"models
{
lod = {"whatever model is", 30};
collision = "whatever model is-COLLISION";
}
argument
{
argument = 70;
skin
{
value = 0.0;
material = {"Main_Body", "standart", "Main_Body_Blue.bmp"};
material = {"Wings", "standart", "Wings_blue.bmp"};
material = {"extras", "standart", "extras_blue.bmp"};
}
skin
{
value = 0.1;
material = {"Main_Body", "standart", "Main_Body_red.bmp"};
material = {"Wings", "standart", "Wings_red.bmp"};
material = {"extras", "standart", "extras_red.bmp"};
} ""
etc..
hope this helps