Extraxt the folder to your Mods folder in Mw2 Lib.
( NB: You need to make a new folder in your mw2 lib / Mods.
Cuse that will be the mods name )
So like this:
1. Make a new folder in your mw2 lib Mods.
2. Open the IWD file with WinRar.
3. Extract the folder in the IWD ( Named Maps )
4. Extract it to your New folder in Mw2 Lib Mods