Help!

When i'm getting a skin on editor i do exactly what the walkthrough says but for some reason it always comes out saying "could not find Goblin\Blademaster\GoblinPraetorian.mdl

Well so i'm loking at the walk through and it says to have it like this
Goblin\Blademaster\GoblinPraetorian.mdx <-----with a x at the end.
warcraft wont let me change it. I'm really confused can someone help? I would be most greatfull.
-red

it always says that when you first import a model, because the world editor doesn't recognize it yet. All you have to do is save the map, close the world editor, re-open it, and re-open the map. The model should work fine.

btw, wrong forum for this.