Just a few unlucky guys (like me) get this error when trying to start Call Of Duty Modern Warfare II with AlterIW net.
“The main/iw_22.iwd file is incorrect
The problem with this error is that it does not give you any actual hint on how to solve this problem. The file is correct, try reinstalling from scratch but you will only be wasting your time.
Actually the problem is a networking one!!! no not a file mismatch or corruption. Just go here and follow the method the same that I used to play Resident Evil 5 on LAN
I quote this from that page :
On Vista, open the “Network and sharing center”
From the left pane select “manage network connections”
press the “ALT key” on your keyboard. the top menus will appear
Select “advanced settings” from the menu “advanced”
Use the arrows to move your LAN card up in the list then save everything.
Thats That my friend, Enjoy AlterIW and don’t cheat or noob tube.
UPDATE 1 !
If the method above is not working for you, maybe you can try the following methods:
RudeBoy method: I have two cards, one is broken, so I disabled it, that was the problem.
Nixan Method: MAC RESETTING (if you changed it before)
Control Panel\Network and Internet\Network Connections\
Open Local Area Connection Properties
Open Advanced tab
Select Network Address and check Not Present
If you have tried everything here and still have a problem, you probably have messed your iw_22.iwd, you can download the copy that is currently working for me here
Please continue to report if any of these worked for you, and if not how did you solve the problem.