MDF files?

So i downloaded Need for speed most wanted from WBB,which is MDF file,how can i use it?
Thanks.
Answer #1
Use daemon tools. You can download it from:
www.daemon-tools.cc
Answer #2
are you sure?because it doesnt work
Answer #3
Use Magic Iso to open a MDF file extension:

1. Run MagicISO
2. Click button on toolbar
3. Choose MDF file and click Ok.
4. Click to extract files and folder from MDF files.