Appid Is Not Configured Call Of Duty Black Ops 2 ((better)) «Must Read»

Discord, NVIDIA GeForce Experience, and MSI Afterburner often inject overlays into DirectX games. For Black Ops 2 , these overlays can confuse the Steam AppID handshake.

If deleting the appinfo.vdf file did not solve the problem, the next step is to clear the download cache. This forces Steam to flush out old temporary files that might be interfering with game launches. Appid Is Not Configured Call Of Duty Black Ops 2

Once you have solved the "Appid Is Not Configured" error, you can prevent it from returning by: NVIDIA GeForce Experience