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Windows Core OS (WCOS) is an abandoned internal Microsoft effort that aimed to provide a universal, modular base for future versions of Microsoft Windows. The operating system is still based on the NT kernel, although most legacy features found in regular desktop Windows have been removed. Instead of the traditional Windows Explorer shell, the platform uses a newly-built GUI stack based on DirectX and the UWP/WinUI frameworks. By default, WCOS variants are not natively compatible with applications using the legacy User and GDI libraries for their user interface; however, they can run virtualized using either remoting or a purpose-built container.