Sorry for the inconvenience of having to help yet another choob, but this one's fast.

Basically, I want to take all the files used in the new dlc, and copy them into steam and play them there. I've tried all the (necessary) map files. iw_22, and iw_23. Surely I'm missing something.

Also, when I did copy the files into my steam's MW2 folder, it reads, "Steam must be running in order to play this game." That could be a whole different issue.