In Windows 8 and Windows 8.1, you can customize the color of the Start screen using the personalization options from the Settings charm. The color you choose for the Start screen will be applied to your sign-in screen, e.g. the screen you see right after you enter your credentials but before the Start screen appears. However, the screen which lists the user accounts before you sign in and after you sign out has a different color. That color comes from the registry value for the default sign-in screen, which cannot be changed by the user because no option exists inside PC Settings to change it. Let's see how we can change that color.
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