However, in .Net Core, you cannot directly reference it and you need to add the Microsoft.WindowsDesktop.App.WPF package. XPO - .NET Core 3.0 Desktop SDK Support for WinForms and ... Application The latest version. For example, this will work if you call this from a WPF application (see attached). I’m going to use an app with a native entry point that displays a Windows Forms form via C++/CLI. In either the WinForms or WPF server, click Start to start the SignalR service (Starting both servers will throw an error). Can't use Windows.Services.Store with a WPF Net Core 5.0 App WindowsDesktop Reference all of WPF -->