I don't know if it is detected or not, but since it is over a week old, I WOULD NOT
use it.
It might be detected.
If you still want to risk using it,
Start MW2, and at the main menu screen of multiplayer, ALT-TAB out of it and start the .exe that you downloaded. Then change the options in the tabs as needed.
Once again, i would not risk using this any longer.