Compatibility mode is a Windows 11 feature that simulates older Windows versions for your programs. This allows you to run old software on your Windows 11 machine.

Learn how to run the new Program Compatibility Troubleshooter in Get Help app of Windows 11. Troubleshoot program compatibility issues easily!

If you cannot open and run any Program when you click on it, maybe soon after login or after Windows Update in Windows 11/10 take these steps to fix the issue.