This error is most common in cracked versions where the zone directory has been altered.
Do not use the default game launcher; launch the modded client via bgT5Launcher.exe and select to open the zone files correctly. If you are still unable to boot the game, let me know: Exe-cannot-find-zone Black Ops Fix
Call of Duty: Black Ops remains a legendary entry in the franchise, but running it on modern Windows systems often results in frustrating errors. One of the most common issues players face is the (or "Could not find zone") error, which often highlights a missing code_pre_gfx or language-specific file like en_core_pre_gfx . This error is most common in cracked versions
How to Fix the "Exe-cannot-find-zone" Error in Call of Duty: Black Ops One of the most common issues players face
Call of Duty: Black Ops 6 PC Troubleshooting - Activision Support