If your game is a legitimate, region-free copy, the problem is likely an audio driver conflict or file corruption.
The game engine expects a specific global root sound bank ( cmn-root ) tailored for the Polish language version ( .polish ). If you are running an English version of the game but a background registry key or configuration file points to the Polish localization, the game crashes because it cannot find the file. Black Ops 2 Sound Bank Failed To Load Cmn-root.polish
For official Steam users, the client might fail to pull localized sound patches if your platform's base system settings mismatch regional configurations. Open your desktop Steam client application. If your game is a legitimate, region-free copy,
Inspect the very first line of text. If it reads polish : polish Use code with caution. Step 4: Replace that text entirely with english : english Use code with caution. For official Steam users, the client might fail