Fg-optional-mp-zombie-04.bin -

It must be placed in the same folder as the setup.exe and other bin files before starting the installation. If you can tell me: Which Call of Duty game this is (e.g., Black Ops 2, MW3)? Are you trying to play local zombies or online multiplayer ?

If you try to launch zombies or multiplayer without this file, the game will likely close or throw an error indicating missing content. fg-optional-mp-zombie-04.bin

I can give you more specific troubleshooting steps for that game. It must be placed in the same folder as the setup