Windows 10X build 19561

Windows 10X build 19561 is an unleaked build of Windows 10X. This build is mentioned in four screenshots, three of them on a Microsoft Emulator documentation along with builds 19531 and 19540, and another on Microsoft Store used in download pages for builds 19563 and 19578. Judging by the dates provided, it could have been compiled on or before 7 February 2020.