I'm stuck here, I have obtained an fx file and can't apply the effect to my level walls, here is what I have done.

I'm posting my question here as I think this question is very trivial for the shader forum.

1- I put the fx file in the same directory as my game studio script file

2- created a material block with an effect pointing to the fx file

3- tried to assign the material to a wall in my level from the block properties then clicked material icon but the list is empty and I can't find my mterial in this list.

here is the code of my script

That sounds like you've forgotten to attach your script to the map. Goto File -> Map Properties and select your script there.

I forgot to mention that I have done that, but it still doesn't appear in the materials list

Just type the material name into the emtpy field manually then.

Shouldn't it be MATERIAL* NormalMapped = ....?

Yes, it should, but it even shows up in the material list when the * is missing.

I have added the astrisk but no use, still didn't show up in the block materials list . my script extention is .c does this make a difference?

I just figured out how to make it work, all I did was removing the script file from the map properties, build the project, close WED, then open WED re-added the script file (with the .c extension). Now it shows up in the list. thanks a lot guys for all your quick help and support.

Then your files do not reload automatically, adjust this setting in WED's preferences.