I'm quite sure that this is no normal mapping.
Above there's a link to a .rar archive containing the .wmb and .wmp file (and some other). you can create a new project in SED and take a look at it yourself if you want to

Where can I change the shader parameters?
I use the default gamestudio shader.
This is the script file of my map:
///////////////////////////////
#include <acknex.h>
#include <default.c>
#include <mtlFX.c>
///////////////////////////////
function main()
{
level_load("TestLevel.WMB");
}