- Application host must call
ApplicationExtensionHost.Initialize<TApplication>(TApplication app)before calling any other extension APIs. ApplicationExtensions.LoadExtension(this Application, Assembly)extension method removed. Callers should instead callApplicationExtensionHost.Current.LoadExtensionAsync.WinUIExtensions.LoadComponent<T>(this T, ref bool, [CallerFilePath]string="")is no longer templated, any explicit template specifications must be removed.