The Test Mode watermark in Windows appears if you install digitally unsigned drivers. Learn how to remove the Test Mode watermark.

What Is Compatibility Mode? 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.

If you want to change Compatibility Mode settings for programs or apps in Windows 11/10, you can do it in 3 ways. We show you how.

The compatibility mode in Windows 10 or 11 is an excellent way to run old versions of software.

Microsoft removed the ability to boot to DOS in order to speed the start-up of Windows Me and to eliminate the support hassles caused by real-mode device drivers that load before Windows.