v0.16.0 — ThemedMessageBox replacing native MessageBox everywhere

The Win32 MessageBox uses the system white-on-gray look that clashes
with the launcher's dark theme (jarring transition every time we
confirm a cancel, show an error, etc.). Replaced with a custom WPF
dialog that:

- Drops in : same Show(message, title, button, icon, default) API as
  System.Windows.MessageBox, returns the same MessageBoxResult.
- Looks native to the launcher : dark Brush.Bg.Window background,
  Brush.Border outline, Brush.Text.Primary content, AccentButton for
  the default action and SecondaryButton for the others.
- Iconography by emoji + colour code : ⛔ red (Error), ⚠ amber (Warning),
  ❓ neutral (Question), ℹ blue (Information). Mapped from MessageBoxImage.
- Buttons localised via Strings.ActionOk / ActionYes / ActionNo /
  ActionCancel — works in fr/en/zh/th/ar like the rest of the UI.
- Owner = currently active window (falls back to MainWindow then
  CenterScreen) so it positions correctly even from a child dialog.
- Esc resolves to Cancel/No matching MessageBox semantics.

The 21 MessageBox.Show call sites across MainViewModel, SettingsViewModel,
LicenseDetailsDialog and MainWindow now use ThemedMessageBox.Show with
no signature change — full grep replace + tiny `using` adjustments.

Versions bumped to 0.16.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

installer/PSLauncher.iss

@@ -11,7 +11,7 @@
 
 #define MyAppName        "PROSERVE Launcher"
 #define MyAppShortName   "PS_Launcher"
-#define MyAppVersion     "0.15.0"
+#define MyAppVersion     "0.16.0"
 #define MyAppPublisher   "ASTERION VR"
 #define MyAppURL         "https://asterionvr.com"
 #define MyAppExeName     "PS_Launcher.exe"

src/PSLauncher.App/PSLauncher.App.csproj

@@ -15,9 +15,9 @@
     <Product>PROSERVE Launcher</Product>
     <Copyright>© 2026 ASTERION VR — All rights reserved</Copyright>
     <RootNamespace>PSLauncher.App</RootNamespace>
-    <Version>0.15.0</Version>
+    <Version>0.16.0</Version>
-    <AssemblyVersion>0.15.0.0</AssemblyVersion>
+    <AssemblyVersion>0.16.0.0</AssemblyVersion>
-    <FileVersion>0.15.0.0</FileVersion>
+    <FileVersion>0.16.0.0</FileVersion>
 
     <!-- Single-file self-contained publish profile (used by `dotnet publish`) -->
     <PublishSingleFile>true</PublishSingleFile>

src/PSLauncher.App/ViewModels/MainViewModel.cs

@@ -438,7 +438,7 @@ public sealed partial class MainViewModel : ObservableObject
         catch (Exception ex)
         {
             _logger.LogError(ex, "Self-update failed");
-            MessageBox.Show(Strings.MsgSelfUpdateFailed(ex.Message),
+            ThemedMessageBox.Show(Strings.MsgSelfUpdateFailed(ex.Message),
                 Strings.MsgBoxError, MessageBoxButton.OK, MessageBoxImage.Error);
             StatusMessage = Strings.StatusSelfUpdateError(ex.Message);
             IsBusy = false;
@@ -518,7 +518,7 @@ public sealed partial class MainViewModel : ObservableObject
     private void CancelDownload()
     {
         if (_activeDownloadCts is null || _activeRow is null) return;
-        var confirm = MessageBox.Show(
+        var confirm = ThemedMessageBox.Show(
             Strings.MsgCancelDownloadConfirm(_activeRow.Version),
             Strings.MsgBoxCancelDl,
             MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);
@@ -535,7 +535,7 @@ public sealed partial class MainViewModel : ObservableObject
         // Si un DL est actif sur cette même row, on doit d'abord l'annuler proprement.
         var st = _downloadManager.GetResumableState(row.Version);
         var sizeStr = FormatSize(st?.DownloadedBytes ?? 0);
-        var confirm = MessageBox.Show(
+        var confirm = ThemedMessageBox.Show(
             Strings.MsgRestartDownloadConfirm(row.Version, sizeStr),
             Strings.MsgBoxRestartDl,
             MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
@@ -605,7 +605,7 @@ public sealed partial class MainViewModel : ObservableObject
         catch (Exception ex)
         {
             _logger.LogError(ex, "Launch failed");
-            MessageBox.Show(Strings.MsgLaunchFailed(ex.Message),
+            ThemedMessageBox.Show(Strings.MsgLaunchFailed(ex.Message),
                 Strings.MsgBoxLaunchError, MessageBoxButton.OK, MessageBoxImage.Error);
         }
     }
@@ -613,7 +613,7 @@ public sealed partial class MainViewModel : ObservableObject
     private async Task InstallVersionAsync(VersionRowViewModel row)
     {
         if (row.Remote is null) return;
-        if (IsBusy) { MessageBox.Show(Strings.MsgBusy, Strings.MsgBoxPatience, MessageBoxButton.OK, MessageBoxImage.Information); return; }
+        if (IsBusy) { ThemedMessageBox.Show(Strings.MsgBusy, Strings.MsgBoxPatience, MessageBoxButton.OK, MessageBoxImage.Information); return; }
 
         IsBusy = true;
         _activeRow = row;
@@ -738,7 +738,7 @@ public sealed partial class MainViewModel : ObservableObject
                     // notifie l'utilisateur que la DB n'a pas été migrée — la prochaine relance
                     // de l'install (ou un Settings → "Rejouer migrations") tentera à nouveau.
                     _logger.LogError("DB migration failed for v{Version}: {Detail}", row.Version, migResult.FailureMessage);
-                    MessageBox.Show(
+                    ThemedMessageBox.Show(
                         Strings.MsgMigrationFailed(migResult.FailureMessage ?? "?"),
                         Strings.MsgBoxMigrationFailed,
                         MessageBoxButton.OK, MessageBoxImage.Warning);
@@ -779,13 +779,13 @@ public sealed partial class MainViewModel : ObservableObject
                         _logger.LogInformation("No _report/ in v{Version} ZIP, report tool unchanged", row.Version);
                         break;
                     case DeployStatus.XamppNotFound:
-                        MessageBox.Show(
+                        ThemedMessageBox.Show(
                             Strings.MsgReportXamppNotFound(_config.ReportTool.HtdocsRoot),
                             Strings.MsgBoxReportDeployFailed,
                             MessageBoxButton.OK, MessageBoxImage.Warning);
                         break;
                     case DeployStatus.Failed:
-                        MessageBox.Show(
+                        ThemedMessageBox.Show(
                             Strings.MsgReportDeployFailed(rdResult.ErrorMessage ?? "?"),
                             Strings.MsgBoxReportDeployFailed,
                             MessageBoxButton.OK, MessageBoxImage.Warning);
@@ -818,7 +818,7 @@ public sealed partial class MainViewModel : ObservableObject
             row.State = VersionRowState.AvailableIdle;
             row.ProgressDetail = null;
             row.ProgressPercent = 0;
-            MessageBox.Show(
+            ThemedMessageBox.Show(
                 Strings.MsgInstallFailed(ex.Message),
                 Strings.MsgBoxError, MessageBoxButton.OK, MessageBoxImage.Error);
             StatusMessage = Strings.StatusError(ex.Message);
@@ -841,14 +841,14 @@ public sealed partial class MainViewModel : ObservableObject
         if (row.Installed is null) return;
 
         var sizeStr = FormatSize(row.SizeBytes);
-        var confirm = MessageBox.Show(
+        var confirm = ThemedMessageBox.Show(
             Strings.MsgUninstallConfirm(row.Version, row.FolderPath, sizeStr),
             Strings.MsgBoxConfirm,
             MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
 
         if (confirm != MessageBoxResult.Yes) return;
 
-        if (IsBusy) { MessageBox.Show(Strings.MsgBusy, Strings.MsgBoxPatience, MessageBoxButton.OK, MessageBoxImage.Information); return; }
+        if (IsBusy) { ThemedMessageBox.Show(Strings.MsgBusy, Strings.MsgBoxPatience, MessageBoxButton.OK, MessageBoxImage.Information); return; }
 
         IsBusy = true;
         row.State = VersionRowState.Uninstalling;
@@ -863,7 +863,7 @@ public sealed partial class MainViewModel : ObservableObject
         {
             _logger.LogError(ex, "Uninstall failed for {Version}", row.Version);
             row.State = VersionRowState.InstalledIdle;
-            MessageBox.Show(Strings.MsgUninstallFailed(ex.Message), Strings.MsgBoxError,
+            ThemedMessageBox.Show(Strings.MsgUninstallFailed(ex.Message), Strings.MsgBoxError,
                 MessageBoxButton.OK, MessageBoxImage.Error);
             StatusMessage = Strings.StatusError(ex.Message);
         }
@@ -878,7 +878,7 @@ public sealed partial class MainViewModel : ObservableObject
         var url = row.Remote?.ReleaseNotesUrl;
         if (string.IsNullOrEmpty(url))
         {
-            MessageBox.Show(Strings.MsgNoReleaseNotes,
+            ThemedMessageBox.Show(Strings.MsgNoReleaseNotes,
                 Strings.MsgBoxReleaseNotes, MessageBoxButton.OK, MessageBoxImage.Information);
             return;
         }
@@ -887,7 +887,7 @@ public sealed partial class MainViewModel : ObservableObject
         catch (Exception ex)
         {
             _logger.LogWarning(ex, "Failed to fetch release notes");
-            MessageBox.Show(Strings.MsgReleaseNotesFetchFailed(ex.Message),
+            ThemedMessageBox.Show(Strings.MsgReleaseNotesFetchFailed(ex.Message),
                 Strings.MsgBoxError, MessageBoxButton.OK, MessageBoxImage.Warning);
             return;
         }

src/PSLauncher.App/ViewModels/SettingsViewModel.cs

@@ -6,6 +6,7 @@ using System.Windows;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using Microsoft.Extensions.Logging;
+using PSLauncher.App.Views;
 using PSLauncher.Core.Configuration;
 using PSLauncher.Core.Downloads;
 using PSLauncher.Core.Installations;
@@ -239,7 +240,7 @@ public sealed partial class SettingsViewModel : ObservableObject
     [RelayCommand]
     private void ClearCache()
     {
-        var confirm = MessageBox.Show(
+        var confirm = ThemedMessageBox.Show(
             Strings.MsgClearCacheConfirm,
             Strings.MsgBoxConfirm,
             MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
@@ -256,7 +257,7 @@ public sealed partial class SettingsViewModel : ObservableObject
         catch (Exception ex)
         {
             _logger.LogError(ex, "ClearCache failed");
-            MessageBox.Show(ex.Message, Strings.MsgBoxError, MessageBoxButton.OK, MessageBoxImage.Error);
+            ThemedMessageBox.Show(ex.Message, Strings.MsgBoxError, MessageBoxButton.OK, MessageBoxImage.Error);
         }
     }
 
@@ -304,7 +305,7 @@ public sealed partial class SettingsViewModel : ObservableObject
             // Le launcher doit être relancé pour que les bindings x:Static reflètent
             // la nouvelle langue. Plutôt que de demander à l'utilisateur de fermer/rouvrir,
             // on spawne un cmd qui attend la fermeture puis relance.
-            var ok = MessageBox.Show(
+            var ok = ThemedMessageBox.Show(
                 Strings.MsgLanguageRestart,
                 Strings.MsgBoxLanguageChange,
                 MessageBoxButton.OKCancel, MessageBoxImage.Information, MessageBoxResult.OK);
@@ -335,7 +336,7 @@ public sealed partial class SettingsViewModel : ObservableObject
     [RelayCommand]
     private void DeactivateLicense()
     {
-        var confirm = MessageBox.Show(
+        var confirm = ThemedMessageBox.Show(
             Strings.MsgDeactivateLicenseConfirm,
             Strings.MsgBoxConfirm,
             MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);
@@ -526,7 +527,7 @@ public sealed partial class SettingsViewModel : ObservableObject
     {
         var localDate = backup.TimestampUtc.ToLocalTime();
         var dateLabel = Strings.FormatLongDate(localDate);
-        var confirm = MessageBox.Show(
+        var confirm = ThemedMessageBox.Show(
             Strings.MsgRevertReportConfirm(dateLabel),
             Strings.MsgBoxRevertReport,
             MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);

src/PSLauncher.App/Views/LicenseDetailsDialog.xaml.cs

@@ -66,7 +66,7 @@ public partial class LicenseDetailsDialog : Window
 
     private void OnDeactivate(object sender, RoutedEventArgs e)
     {
-        var confirm = MessageBox.Show(
+        var confirm = ThemedMessageBox.Show(
             Strings.MsgDeactivateLicenseDetailedConfirm,
             Strings.MsgBoxConfirm,
             MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);

src/PSLauncher.App/Views/MainWindow.xaml.cs

@@ -42,7 +42,7 @@ public partial class MainWindow : Window
         if (DataContext is MainViewModel vm && vm.HasActiveDownload)
         {
             var version = vm.ActiveDownloadVersion ?? "?";
-            var result = MessageBox.Show(
+            var result = ThemedMessageBox.Show(
                 Strings.MsgQuitWhileDownloadingConfirm(version),
                 Strings.MsgBoxQuit,
                 MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);

src/PSLauncher.App/Views/ThemedMessageBox.xaml

@@ -0,0 +1,72 @@
+<Window x:Class="PSLauncher.App.Views.ThemedMessageBox"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:loc="clr-namespace:PSLauncher.Core.Localization;assembly=PSLauncher.Core"
+        Title=""
+        Icon="pack://application:,,,/Resources/favicon.ico"
+        SizeToContent="Height"
+        Width="480"
+        MinHeight="180"
+        MaxHeight="600"
+        ResizeMode="NoResize"
+        ShowInTaskbar="False"
+        WindowStartupLocation="CenterOwner"
+        Background="{StaticResource Brush.Bg.Window}">
+    <Border BorderBrush="{StaticResource Brush.Border}" BorderThickness="1">
+        <Grid Margin="24,20">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto" />
+                <RowDefinition Height="*" />
+                <RowDefinition Height="Auto" />
+            </Grid.RowDefinitions>
+
+            <!-- Title -->
+            <TextBlock Grid.Row="0"
+                       x:Name="TitleText"
+                       FontSize="16" FontWeight="SemiBold"
+                       Foreground="{StaticResource Brush.Text.Primary}"
+                       Margin="0,0,0,12" />
+
+            <!-- Icon + Message -->
+            <Grid Grid.Row="1">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="Auto" />
+                    <ColumnDefinition Width="*" />
+                </Grid.ColumnDefinitions>
+                <TextBlock Grid.Column="0"
+                           x:Name="IconText"
+                           FontSize="36"
+                           Margin="0,2,16,0"
+                           VerticalAlignment="Top" />
+                <TextBlock Grid.Column="1"
+                           x:Name="MessageText"
+                           TextWrapping="Wrap"
+                           FontSize="13" LineHeight="20"
+                           Foreground="{StaticResource Brush.Text.Primary}"
+                           VerticalAlignment="Center" />
+            </Grid>
+
+            <!-- Buttons -->
+            <StackPanel Grid.Row="2"
+                        Orientation="Horizontal"
+                        HorizontalAlignment="Right"
+                        Margin="0,24,0,0">
+                <Button x:Name="Btn1"
+                        Style="{StaticResource SecondaryButton}"
+                        MinWidth="80" Padding="16,8" Margin="0,0,8,0"
+                        Visibility="Collapsed"
+                        Click="OnBtn1Click" />
+                <Button x:Name="Btn2"
+                        Style="{StaticResource SecondaryButton}"
+                        MinWidth="80" Padding="16,8" Margin="0,0,8,0"
+                        Visibility="Collapsed"
+                        Click="OnBtn2Click" />
+                <Button x:Name="Btn3"
+                        Style="{StaticResource AccentButton}"
+                        MinWidth="80" Padding="16,8"
+                        Visibility="Collapsed"
+                        Click="OnBtn3Click" />
+            </StackPanel>
+        </Grid>
+    </Border>
+</Window>

src/PSLauncher.App/Views/ThemedMessageBox.xaml.cs

@@ -0,0 +1,187 @@
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Media;
+using PSLauncher.Core.Localization;
+
+namespace PSLauncher.App.Views;
+
+/// <summary>
+/// Drop-in pour <see cref="System.Windows.MessageBox"/> avec un look qui colle
+/// au reste de la UI (dark theme, accent ASTERION). API copiée :
+/// <code>
+///   ThemedMessageBox.Show("Texte", "Titre", MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);
+/// </code>
+///
+/// Notes :
+/// - <see cref="MessageBoxImage"/> est mappé vers une icône emoji + couleur.
+/// - Les libellés des boutons (OK / Yes / No / Cancel) sont localisés via <see cref="Strings"/>.
+/// - Owner = MainWindow par défaut (centrage), peut être passé explicitement.
+/// - Esc renvoie Cancel ou No selon le bouton défini comme cancel.
+/// </summary>
+public partial class ThemedMessageBox : Window
+{
+    public MessageBoxResult Result { get; private set; } = MessageBoxResult.None;
+
+    private MessageBoxResult _btn1Result = MessageBoxResult.None;
+    private MessageBoxResult _btn2Result = MessageBoxResult.None;
+    private MessageBoxResult _btn3Result = MessageBoxResult.None;
+
+    private ThemedMessageBox(string message, string title, MessageBoxButton button,
+                             MessageBoxImage icon, MessageBoxResult defaultResult)
+    {
+        InitializeComponent();
+
+        Title = title;
+        TitleText.Text = title;
+        MessageText.Text = message;
+        SetIcon(icon);
+        SetupButtons(button, defaultResult);
+
+        // Esc = cancel/no
+        PreviewKeyDown += (_, e) =>
+        {
+            if (e.Key == Key.Escape)
+            {
+                Result = button switch
+                {
+                    MessageBoxButton.OK            => MessageBoxResult.OK,
+                    MessageBoxButton.OKCancel      => MessageBoxResult.Cancel,
+                    MessageBoxButton.YesNo         => MessageBoxResult.No,
+                    MessageBoxButton.YesNoCancel   => MessageBoxResult.Cancel,
+                    _                               => MessageBoxResult.None,
+                };
+                DialogResult = false;
+                Close();
+            }
+        };
+    }
+
+    private void SetIcon(MessageBoxImage icon)
+    {
+        // NOTE : MessageBoxImage.Stop ≡ Error (16) et Asterisk ≡ Information (64)
+        // côté enum .NET, donc on ne switche que sur les noms canoniques.
+        switch (icon)
+        {
+            case MessageBoxImage.Error:    // = Stop = Hand
+                IconText.Text = "⛔";
+                IconText.Foreground = new SolidColorBrush(Color.FromRgb(0xEF, 0x44, 0x44));
+                break;
+            case MessageBoxImage.Warning:  // = Exclamation
+                IconText.Text = "⚠";
+                IconText.Foreground = new SolidColorBrush(Color.FromRgb(0xF5, 0x9E, 0x0B));
+                break;
+            case MessageBoxImage.Question:
+                IconText.Text = "❓";
+                break;
+            case MessageBoxImage.Information:  // = Asterisk
+                IconText.Text = "ℹ";
+                IconText.Foreground = new SolidColorBrush(Color.FromRgb(0x3B, 0x82, 0xF6));
+                break;
+            default:
+                IconText.Visibility = Visibility.Collapsed;
+                break;
+        }
+    }
+
+    /// <summary>
+    /// Configure jusqu'à 3 boutons. L'ordre visuel est gauche → droite, avec
+    /// le bouton "principal" (default) en accent à l'extrême droite. Les autres
+    /// en secondary à gauche.
+    /// </summary>
+    private void SetupButtons(MessageBoxButton button, MessageBoxResult defaultResult)
+    {
+        // Liste (label, result) dans l'ordre où on veut les afficher
+        var btns = button switch
+        {
+            MessageBoxButton.OK            => new[] { (Strings.ActionOk, MessageBoxResult.OK) },
+            MessageBoxButton.OKCancel      => new[] {
+                (Strings.ActionCancel, MessageBoxResult.Cancel),
+                (Strings.ActionOk,     MessageBoxResult.OK),
+            },
+            MessageBoxButton.YesNo         => new[] {
+                (Strings.ActionNo,  MessageBoxResult.No),
+                (Strings.ActionYes, MessageBoxResult.Yes),
+            },
+            MessageBoxButton.YesNoCancel   => new[] {
+                (Strings.ActionCancel, MessageBoxResult.Cancel),
+                (Strings.ActionNo,     MessageBoxResult.No),
+                (Strings.ActionYes,    MessageBoxResult.Yes),
+            },
+            _ => new[] { (Strings.ActionOk, MessageBoxResult.OK) },
+        };
+
+        // Btn3 = bouton accent (le plus à droite, principal). Toujours rempli.
+        // Btn2 = secondary à sa gauche, optionnel.
+        // Btn1 = secondary tout à gauche, optionnel.
+        // On remplit en partant de la fin pour que l'accent soit toujours sur Btn3.
+        var slots = new[] { Btn1, Btn2, Btn3 };
+        var resultSetters = new System.Action<MessageBoxResult>[]
+        {
+            r => _btn1Result = r,
+            r => _btn2Result = r,
+            r => _btn3Result = r,
+        };
+
+        int startSlot = 3 - btns.Length;
+        for (int i = 0; i < btns.Length; i++)
+        {
+            int slotIdx = startSlot + i;
+            slots[slotIdx].Content = btns[i].Item1;
+            slots[slotIdx].Visibility = Visibility.Visible;
+            resultSetters[slotIdx](btns[i].Item2);
+            // Default = celui dont le result match defaultResult
+            if (btns[i].Item2 == defaultResult)
+                slots[slotIdx].IsDefault = true;
+        }
+
+        // Si aucun match exact pour le default, on prend le bouton principal (Btn3)
+        if (Btn3.Visibility == Visibility.Visible && !Btn1.IsDefault && !Btn2.IsDefault && !Btn3.IsDefault)
+            Btn3.IsDefault = true;
+    }
+
+    private void OnBtn1Click(object sender, RoutedEventArgs e) => Finish(_btn1Result);
+    private void OnBtn2Click(object sender, RoutedEventArgs e) => Finish(_btn2Result);
+    private void OnBtn3Click(object sender, RoutedEventArgs e) => Finish(_btn3Result);
+
+    private void Finish(MessageBoxResult result)
+    {
+        Result = result;
+        DialogResult = true;
+        Close();
+    }
+
+    // ===================== STATIC SHOW OVERLOADS =====================
+
+    public static MessageBoxResult Show(string message)
+        => Show(message, string.Empty, MessageBoxButton.OK, MessageBoxImage.None, MessageBoxResult.OK);
+
+    public static MessageBoxResult Show(string message, string title)
+        => Show(message, title, MessageBoxButton.OK, MessageBoxImage.None, MessageBoxResult.OK);
+
+    public static MessageBoxResult Show(string message, string title, MessageBoxButton button)
+        => Show(message, title, button, MessageBoxImage.None, DefaultFor(button));
+
+    public static MessageBoxResult Show(string message, string title, MessageBoxButton button, MessageBoxImage icon)
+        => Show(message, title, button, icon, DefaultFor(button));
+
+    public static MessageBoxResult Show(string message, string title, MessageBoxButton button,
+                                        MessageBoxImage icon, MessageBoxResult defaultResult)
+    {
+        var owner = Application.Current?.Windows.OfType<Window>().FirstOrDefault(w => w.IsActive)
+                 ?? Application.Current?.MainWindow;
+        var dlg = new ThemedMessageBox(message, title, button, icon, defaultResult);
+        if (owner is not null && owner.IsVisible) dlg.Owner = owner;
+        else dlg.WindowStartupLocation = WindowStartupLocation.CenterScreen;
+        dlg.ShowDialog();
+        return dlg.Result;
+    }
+
+    private static MessageBoxResult DefaultFor(MessageBoxButton button) => button switch
+    {
+        MessageBoxButton.OK            => MessageBoxResult.OK,
+        MessageBoxButton.OKCancel      => MessageBoxResult.OK,
+        MessageBoxButton.YesNo         => MessageBoxResult.Yes,
+        MessageBoxButton.YesNoCancel   => MessageBoxResult.Yes,
+        _                               => MessageBoxResult.None,
+    };
+}

src/PSLauncher.Core/Localization/Strings.cs

@@ -102,6 +102,9 @@ public static class Strings
     public static string ActionInstall      => T("⬇  Installer",    "⬇  Install",      "⬇  安装", "⬇  ติดตั้ง",  "⬇  تثبيت");
     public static string ActionInstallBig   => T("⬇  INSTALLER",    "⬇  INSTALL",      "⬇  安装", "⬇  ติดตั้ง",  "⬇  تثبيت");
     public static string ActionCancel       => T("Annuler",         "Cancel",          "取消",   "ยกเลิก",     "إلغاء");
+    public static string ActionOk           => T("OK",              "OK",              "确定",   "ตกลง",       "موافق");
+    public static string ActionYes          => T("Oui",             "Yes",             "是",     "ใช่",        "نعم");
+    public static string ActionNo           => T("Non",             "No",              "否",     "ไม่",        "لا");
     public static string ActionLater        => T("Plus tard",       "Later",           "稍后",   "ภายหลัง",    "لاحقاً");
     public static string ActionSave         => T("Enregistrer",     "Save",            "保存",   "บันทึก",     "حفظ");
     public static string ActionClose        => T("Fermer",          "Close",           "关闭",   "ปิด",        "إغلاق");

src/PSLauncher.Updater/PSLauncher.Updater.csproj

@@ -8,7 +8,7 @@
     <LangVersion>latest</LangVersion>
     <AssemblyName>PS_Launcher.Updater</AssemblyName>
     <RootNamespace>PSLauncher.Updater</RootNamespace>
-    <Version>0.15.0</Version>
+    <Version>0.16.0</Version>
     <ApplicationIcon>..\PSLauncher.App\Resources\favicon.ico</ApplicationIcon>
     <Company>ASTERION VR</Company>
     <Copyright>© 2026 ASTERION VR — All rights reserved</Copyright>