Windows 10 build 17661 (rs onecore dep uxp dev.180502)

Windows 10 build 17661 (rs_onecore_dep_uxp_drv) is an unleaked build of Windows 10 October 2018 Update. It was showcased in the session "What's New for Windows UX Developers: Fluent and XAML" at the Microsoft Build 2018 conference, as well as in the video "Exploring the Fluent Design System" uploaded on YouTube by Microsoft Developer on 24 August 2018.