Basic window handling.

Wino.Core.UWP/Services/AppShellService.cs

@@ -0,0 +1,19 @@
+#if NET8_0
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+#else
+using Windows.UI.Xaml;
+#endif
+
+namespace Wino.Core.WinUI.Services
+{
+    public interface IAppShellService
+    {
+        Window AppWindow { get; set; }
+    }
+
+    public class AppShellService : IAppShellService
+    {
+        public Window AppWindow { get; set; }
+    }
+}

Wino.Core.UWP/Services/NativeAppService.cs

@@ -2,7 +2,6 @@
 using System.Threading.Tasks;
 using Windows.ApplicationModel;
 using Windows.Foundation.Metadata;
-using Windows.Security.Authentication.Web;
 using Windows.Security.Cryptography;
 using Windows.Security.Cryptography.Core;
 using Windows.Storage;
@@ -27,7 +26,16 @@ namespace Wino.Services
         private string _mimeMessagesFolder;
         private string _editorBundlePath;
 
-        public string GetWebAuthenticationBrokerUri() => WebAuthenticationBroker.GetCurrentApplicationCallbackUri().AbsoluteUri;
+        public string GetWebAuthenticationBrokerUri()
+        {
+#if NET8_0
+            // WinUI
+            return "wino://winomail.app";
+#else
+            return WebAuthenticationBroker.GetCurrentApplicationCallbackUri().AbsoluteUri;
+#endif
+
+        }
 
         public async Task<string> GetMimeMessageStoragePath()
         {

Wino.Core.UWP/Services/ThemeService.cs

@@ -165,8 +165,13 @@ namespace Wino.Services
 
             // Save reference as this might be null when the user is in another app
 
+
+#if NET8_0
             // WinUI
+#else
             mainApplicationFrame = Window.Current.Content as Frame;
+#endif
+
 
             if (mainApplicationFrame == null) return;