https://www.theregister.co.uk/2019/07/30/microsoft_releases_go_live_net_core_3_preview_complete_with_desktop_app_support/

Microsoft has released .NET Core 3.0 Preview 7 and Visual Studio 16.3 Preview 1, which work together to enable new features including Windows desktop applications built with .NET Core and C# 8.0.

NET Core 3.0 is the first version of Microsoft's open-source, cross-platform fork of .NET that is able to target Windows Presentation Foundation (WPF) and Windows Forms, the two most commonly used frameworks for Windows desktop applications.