The Windows UI Library (WinUI) serves as a native framework designed to enhance user experiences (UX) for both desktop and Universal Windows Platform (UWP) applications. By integrating the Fluent Design System across all elements, including controls and aesthetics, WinUI ensures that applications deliver a cohesive, user-friendly, and accessible interface that aligns with contemporary UI trends. It accommodates the development of both new and existing applications, allowing developers to either create from scratch or seamlessly transition their current MFC, WinForms, or WPF applications, utilizing well-known programming languages such as C++, C#, Visual Basic, and JavaScript (through React Native for Windows). Moreover, this versatility enables developers to leverage modern design principles while maintaining familiarity with their coding practices. In doing so, WinUI not only enhances the development process but also enriches the overall user engagement with applications.