Irrlicht Engine

I have:

#ifndef __MAIN_H_INCLUDED__
#define __MAIN_H_INCLUDED__

#include <XMLDocument.h>
#include <Irrlicht.h>
using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;
using namespace xml;

#include <IrrSteer.h>
using ...

Where can I find XMLDocument.h for Irrlicht?

I fixed something, but it still works. The DX9 work.
I installed everything from scratch.

Now I start the program with Irrlicht and OpenSteer. But I see gray.

Prompt writes to me

Irrlicht Engine version 1.7.1
IrrExtension 13 4.2 <1 patches, 22 extensions, 13 new objects>. Microsoft Windows Vista ...

Thanks again.
I tried several tutorial these days, before you try to use Irrlicht and opensteer. I found Irrlitch extraordinary.
This morning I tried to supplement it by following the tutorial OpenSteer Abusoft

http://abusoft.g0dsoft.com/Irrlicht/OpenSteer/turorial/ostut1.html

I had a bug in ...

I don't want do use 3d max if possible.
But I want understand how work Irrlicht animations.

create a real time crowd simulation. Using Irrlicht and opensteer.

someone can tell me if there are other formats as well .PK3?

Thanks for the help. Now I am trying Irrlicht tutorials.
Quake3Map Costume SceneNode etc...
One question. Can I create cobemap or create animations and use them with Daz and 3DMax for Irrlicht?

Hello everyone,
I tried your tutorial on youtube to install codebox and Irrlicht.
I wanted to ask what is the best way to implement Opensteer with Irrlicht. There is a guide, an example to follow?
Thanks for the help.
Forgive my bad English.