Where can I find an official or recommended Windows desktop application user interface usability and style guide?

1. What is the Windows user interface?
2. What is the name of the Windows 10 UI?
3. What is WinUI 3?

What is the Windows user interface?

Windows Forms is a graphical application programming interface for creating managed Windows applications that are based on the . NET Framework. In Windows Forms, a form is a visual surface on which you display information to the user, and through which you receive input from the user.

What is the name of the Windows 10 UI?

Microsoft Design Language (or MDL), previously known as Metro, is a design language created by Microsoft.

What is WinUI 3?

WinUI 3 is the native UI platform component that ships with the Windows App SDK (completely decoupled from Windows SDKs). The Windows App SDK provides a unified set of APIs and tools that can be used to create production desktop apps that target Windows 10 and later, and can be published to the Microsoft Store.