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This is why there are community-created patches and mods (like or IW4x ) that replace steam-api.dll with a custom version to keep multiplayer alive. If you are using one of these mods, you must follow their specific instructions, not the generic Steam fixes above.

, you are likely facing a file corruption or missing file error. This DLL is a crucial component of the Steamworks API that allows the game to communicate with

If you own the game on Steam, the easiest and safest solution is to let the client repair itself. Open your . Right-click on Call of Duty: Modern Warfare 2 . Select Properties > Installed Files . Click Verify integrity of game files .

If you obtained MW2 from a non-Steam source and see steam-api.dll as a "crack" file:

No error.