Medium density fibreboard. You'll need to go down to your local DIY store and get a saw, then you can cut it to shape and make things out of it. Tables for instance.
...I kid of course. Obviously this is a completely free game that you didn't download illegally did you? Because otherwise that would be breaking the rules here.
Anyway, it's a type of image file made with magiciso maker from looking around, try downloading it and see if you can burn it to a DVD. http://download.cnet.com/MagicISO-Ma...-10191803.html