Implemented save as dialog for Windows.

I18N Commander/UI MAUI/Pages/LoadProject.razor.cs

@@ -37,16 +37,14 @@ public partial class LoadProject
 
     }
 
-    private async Task ChooseProjectDestination()
+    private Task ChooseProjectDestination()
     {
-        var projectDestination = await FilePicker.PickAsync(new PickOptions
-        {
-            PickerTitle = "Choose the project destination",
-        });
-
-        if(projectDestination is null)
-            return;
-
-        this.newProjectDestination = projectDestination!.FullPath;
+#if WINDOWS
+        return this.ChooseProjectDestinationWindows();
+#elif MACCATALYST
+        return this.ChooseProjectDestinationMacOS();
+#else
+        return Task.CompletedTask;
+#endif
     }
 }

I18N Commander/UI MAUI/Platforms/MacCatalyst/Pages/LoadProject.razor.mac.cs

@@ -0,0 +1,13 @@
+#if MACCATALYST
+
+namespace UI_MAUI.Pages;
+
+public partial class LoadProject
+{
+    private Task ChooseProjectDestinationMacOS()
+    {
+        return Task.CompletedTask;
+    }
+}
+
+#endif

I18N Commander/UI MAUI/Platforms/Windows/Pages/LoadProject.razor.win.cs

@@ -0,0 +1,33 @@
+#if WINDOWS
+
+namespace UI_MAUI.Pages;
+
+using Windows.Storage.Pickers;
+using WindowsSavePicker = Windows.Storage.Pickers.FileSavePicker;
+
+public partial class LoadProject
+{
+    private async Task ChooseProjectDestinationWindows()
+    {
+        var saveDialog = new WindowsSavePicker
+        {
+            CommitButtonText = "Create the project here",
+            SuggestedStartLocation = PickerLocationId.DocumentsLibrary,
+            FileTypeChoices =
+            {
+                new KeyValuePair<string, IList<string>>("I18N Commander Projects", new List<string> { ".i18nc" }),
+            }
+        };
+
+        var hwnd = ((MauiWinUIWindow)App.Current.Windows[0].Handler.PlatformView).WindowHandle;
+        WinRT.Interop.InitializeWithWindow.Initialize(saveDialog, hwnd);
+
+        var result = await saveDialog.PickSaveFileAsync();
+        if(result is null)
+            return;
+
+        this.newProjectDestination = result.Path;
+    }
+}
+
+#endif