Add MSIXVC2 Preview subtitle to landing card and re-enumerate branches on view navigation

src/PackageUploader.UI/Resources/Strings/MainPage.resx

@@ -206,6 +206,13 @@
   <data name="Msixvc2ButtonText" xml:space="preserve">
     <value>Get started</value>
   </data>
+  <data name="Msixvc2SubtitleText" xml:space="preserve">
+    <value>MSIXVC2 Preview</value>
+  </data>
+  <data name="Msixvc2BodyTextWithLink" xml:space="preserve">
+    <value>Point to your loose file directory containing a MicrosoftGame.config for your PC game. Your files will be packaged and uploaded using the MSIXVC2 format — no pre-built package required.
+Learn more: https://aka.ms/MSIXVC2</value>
+  </data>
   <data name="MakePkg2NotFoundErrorMsg" xml:space="preserve">
     <value>MSIXVC2 upload requires makepkg2 tools, available as a preview in the April 2026 GDK. Install the April 2026 GDK to get started.</value>
   </data>

src/PackageUploader.UI/View/MainPageView.xaml

@@ -240,13 +240,29 @@
                                 Margin="6,0,0,0"
                                 VerticalAlignment="Center"
                                 Visibility="{Binding IsCompactMode, Converter={StaticResource BooleanToVisibilityConverter}}"
-                                ToolTip="{x:Static strings:MainPage.Msixvc2BodyText}">
+                                ToolTip="{x:Static strings:MainPage.Msixvc2BodyTextWithLink}">
                             <Path Data="{StaticResource InfoIconGeometry}"
                                   Stroke="{DynamicResource SecondaryTextBrush}" StrokeThickness="1.2"
                                   Width="14" Height="14" Stretch="Uniform"/>
                         </Button>
                     </StackPanel>
 
+                    <TextBlock Margin="0, 2, 0, 0"
+                               Foreground="{DynamicResource SecondaryTextBrush}"
+                               FontSize="12"
+                               Visibility="{Binding IsCompactMode, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Invert}">
+                        <Run Text="{x:Static strings:MainPage.Msixvc2SubtitleText}"
+                             d:Text="MSIXVC2 Preview"/>
+                        <Hyperlink Command="{Binding PackagingLearnMoreURL}"
+                                   CommandParameter="https://aka.ms/MSIXVC2">
+                            <TextBlock Text="{x:Static strings:MainPage.MakeAPackageBodyURLText}"
+                                       d:Text="(learn more)"
+                                       Foreground="{DynamicResource SecondaryTextBrush}"
+                                       TextDecorations="Underline"
+                                       FontSize="12"/>
+                        </Hyperlink>
+                    </TextBlock>
+
                     <TextBlock Margin="0, 10, 0, 0" TextWrapping="Wrap"
                        Text="{x:Static strings:MainPage.Msixvc2BodyText}"
                        d:Text="Point to your loose file directory containing a MicrosoftGame.config for your PC game. Your files will be packaged and uploaded using the MSIXVC2 format — no pre-built package required."
@@ -347,7 +363,7 @@
                 <Button Grid.Column="1"
                         Style="{StaticResource WindowControlButtonStyle}"
                         Width="24" Height="24" Margin="6,0,0,0"
-                        ToolTip="{x:Static strings:MainPage.Msixvc2BodyText}">
+                        ToolTip="{x:Static strings:MainPage.Msixvc2BodyTextWithLink}">
                     <Path Data="{StaticResource InfoIconGeometry}"
                           Stroke="{DynamicResource SecondaryTextBrush}" StrokeThickness="1.2"
                           Width="14" Height="14" Stretch="Uniform"/>

src/PackageUploader.UI/View/Msixvc2UploadView.xaml.cs

@@ -17,7 +17,11 @@ public Msixvc2UploadView(Msixvc2UploadViewModel viewModel)
         _viewModel = viewModel;
 
         // Register drag drop event handlers after control is initialized
-        this.Loaded += (s, e) => RegisterDragDropHandlers();
+        this.Loaded += (s, e) =>
+        {
+            RegisterDragDropHandlers();
+            _viewModel.RefreshBranchesAsync();
+        };
     }
 
     private void RegisterDragDropHandlers()

src/PackageUploader.UI/ViewModel/Msixvc2UploadViewModel.cs

@@ -374,6 +374,54 @@ private async void GetProductInfoAsync()
         }
     }
 
+    public async void RefreshBranchesAsync()
+    {
+        if (_gameProduct == null || string.IsNullOrEmpty(BigId) || BigId == "None")
+        {
+            return;
+        }
+
+        string previousSelection = BranchOrFlightDisplayName;
+
+        IsLoadingBranchesAndFlights = true;
+        BranchOrFlightErrorMessage = string.Empty;
+
+        try
+        {
+            _branchesAndFlights = await _uploaderService.GetPackageBranchesAsync(_gameProduct, CancellationToken.None);
+
+            List<string> displayNames = [];
+            foreach (var branch in _branchesAndFlights)
+            {
+                if (branch.BranchType == GamePackageBranchType.Branch)
+                    displayNames.Add("Branch: " + branch.Name);
+                else if (branch.BranchType == GamePackageBranchType.Flight)
+                    displayNames.Add("Flight: " + branch.Name);
+            }
+            BranchAndFlightNames = [.. displayNames];
+
+            if (!string.IsNullOrEmpty(previousSelection) && displayNames.Contains(previousSelection))
+            {
+                BranchOrFlightDisplayName = previousSelection;
+            }
+            else
+            {
+                string mainBranch = displayNames.FirstOrDefault(n => n.Equals("Branch: Main", StringComparison.OrdinalIgnoreCase), string.Empty);
+                BranchOrFlightDisplayName = !string.IsNullOrEmpty(mainBranch) ? mainBranch : BranchAndFlightNames.FirstOrDefault(string.Empty);
+            }
+            OnPropertyChanged(nameof(BranchOrFlightDisplayName));
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error refreshing branches for BigId {BigId}.", BigId);
+            BranchOrFlightErrorMessage = $"Error refreshing branches: {ex.Message}";
+        }
+        finally
+        {
+            IsLoadingBranchesAndFlights = false;
+        }
+    }
+
     private async void UpdateMarketGroups()
     {
         if (_branchesAndFlights == null)