Add a second skin to the model (in MED), and add the material "normalmap.fx" on the SCRIPT, then apply it in WED on your model.
Course, FX materials can also be added completely by code, if your entity is being loaded by events or something.
The material supposedly WON'T show in th current version of MED (well, it doesn't show for me), but you can download SHADERVIEW from the resources:

http://server.conitec.net/down/shaderviewer.zip

... and load you model there to see if you correctly added the material.
Shaderview is simply a compiled game, with menus that show a doll in all suported shaders and filters of gamestudio, that you load and choose.
It also have a upper button that allows you to load your OWN model and check FX effects on it, so you can see if it's working right in your game.

Don't forget that C-lite and WDL intructions for .fx materials are different, and some bitmap formats might get non-working because of compression by some older programs.