If you are still struggling, remember that the vibrant MW3 community has largely migrated to clients like (for dedicated servers and anti-cheat), which bypass this error entirely by using a custom executable. However, for purists wanting the vanilla Steam experience, the manual cleanup method remains the gold standard.
Rename your installation folder (e.g., from Call of Duty to Call of Duty NEW ). Restart the launcher; it will show "Install".
For Windows Store/Game Pass users, deleting the Microsoft Store local cache in the AppData/Local/Packages folder can resolve persistent directory errors. mw3 cannot run with the addon in the directory
Once you have fixed the issue, follow these rules to avoid seeing the error again:
Go to your library, right-click , and select Properties -> Installed Files -> Browse . If you are still struggling, remember that the
Right-click cod.exe (or cod ), select , and go to the Compatibility tab. Ensure "Run this program as an administrator" is unchecked .
Often, the game is missing a specific component or has an unnecessary "add-on" that is conflicting with the main launch. Xbox App Users: Right-click the game, select , then go to Restart the launcher; it will show "Install"
Click the cogwheel next to Play -> Scan and Repair . Relocate via "Locate Game" (Battle.net):
The error " MW3 cannot run with the addon in the directory" typically stems from pathing conflicts or corrupted installation files that prevent the game launcher from correctly identifying the game's core files versus its DLC.