Okay so I downloaded the whole 1.3.37a update package and applied it to my MW2 installation, the game worked perfectly fine for a few starts (with new Resurgence maps), and now it complains of the iw_22.iwd being incorrect. I've tried overwriting the iw_22.iwd file direct from the update pack to the main folder, with no success in fixing this issue.
How could this happen? Any help on how to fix this?
Okay funny thing is that this error also happens with the single player iw4sp.exe I have, which isn't even part of the 1.3.37a update!
Hopefully MaxDamage or someone from the AlterIWnet team responds about this issue. I've downloaded the iw_22.iwd file for 1.3.37a from four different sources, and they all don't work. I even tried the 1.3.37 iw_22.iwd file out of curiosity, that displayed the same error also.