The new app development model offers a unified set of APIs (Application Programming Interface) and tools that programmers can use consistently on any application, regardless if they are legacy or modern apps. According to the company documentation, this new approach is seen as a way to complement the existing desktop Windows app platforms and frameworks such as .NET (including Windows Forms and WPF) and C++/Win32 with a standard set of APIs and tools that developers can rely on across these platforms. In other words, with this new approach, developers can add modern elements to existing desktop applications without having to rebuild them from scratch. In the past, only modern apps were able to use modern APIs, but now desktop and modern apps alike will be able to access the new and future components and tools that will be supported on all versions of Windows 10. Project Reunion is still in the early stages, but version 0.5 marks the first release ready for production, and version 1.0 is expected to arrive before the end of the year. In this first release, developers will have access to WinUI 3, localization, text rendering, and MRTCore and DWriteCore components support. Since these are packaged apps, the support distribution is MSIX that provides a modern packaging experience for all apps on Windows 10. All content on this site is provided with no warranties, express or implied. Use any information at your own risk. Always backup of your device and files before making any changes. Privacy policy info.