[Registry Preview] Adds application to Open with list for REG files (#26033)

* 25834

* Asociate Registry Preview with .reg files

* Add setting for making RP default app for .reg files

* Run spellcheck

* Run spellcheck again

* Fix build

---------

Co-authored-by: Stefan Markovic <stefan@janeasystems.com>

src/settings-ui/Settings.UI/Strings/en-us/Resources.resw

@@ -3502,6 +3502,13 @@ Activate by holding the key for the character you want to add an accent to, then
   <data name="RegistryPreview_LaunchButtonControl.Header" xml:space="preserve">
     <value>Launch Registry Preview</value>
   </data>
+  <data name="RegistryPreview_DefaultRegApp.Header" xml:space="preserve">
+    <value>Default app</value>
+  </data>
+  <data name="RegistryPreview_DefaultRegApp.Description" xml:space="preserve">
+    <value>Make Registry Preview default app for opening .reg files</value>
+    <comment>Registry Preview is app name. Do not localize.</comment>
+  </data>
   <data name="PastePlain_ShortcutWarning.Title" xml:space="preserve">
     <value>Using this shortcut may prevent non-text paste actions (e.g. images, files) or built-in paste plain text actions in other applications from functioning.</value>
   </data>

src/settings-ui/Settings.UI/ViewModels/RegistryPreviewViewModel.cs

@@ -3,6 +3,8 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.Globalization;
+using System.Text.Json;
 using global::PowerToys.GPOWrapper;
 using Microsoft.PowerToys.Settings.UI.Library;
 using Microsoft.PowerToys.Settings.UI.Library.Helpers;
@@ -17,7 +19,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
         public ButtonClickCommand LaunchEventHandler => new ButtonClickCommand(Launch);
 
-        public RegistryPreviewViewModel(ISettingsRepository<GeneralSettings> settingsRepository, Func<string, int> ipcMSGCallBackFunc)
+        public RegistryPreviewViewModel(ISettingsRepository<GeneralSettings> settingsRepository, ISettingsRepository<RegistryPreviewSettings> registryPreviewSettingsRepository, Func<string, int> ipcMSGCallBackFunc)
         {
             // To obtain the general settings configurations of PowerToys Settings.
             if (settingsRepository == null)
@@ -27,6 +29,8 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
             GeneralSettingsConfig = settingsRepository.SettingsConfig;
 
+            _settings = registryPreviewSettingsRepository.SettingsConfig;
+
             InitializeEnabledValue();
 
             // set the callback functions value to hangle outgoing IPC message.
@@ -71,6 +75,21 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             }
         }
 
+        public bool IsRegistryPreviewDefaultRegApp
+        {
+            get => _settings.Properties.DefaultRegApp;
+            set
+            {
+                if (_settings.Properties.DefaultRegApp != value)
+                {
+                    _settings.Properties.DefaultRegApp = value;
+                    OnPropertyChanged(nameof(IsRegistryPreviewDefaultRegApp));
+
+                    NotifySettingsChanged();
+                }
+            }
+        }
+
         public bool IsEnabledGpoConfigured
         {
             get => _enabledStateIsGPOConfigured;
@@ -88,11 +107,23 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
         private GpoRuleConfigured _enabledGpoRuleConfiguration;
         private bool _enabledStateIsGPOConfigured;
         private bool _isRegistryPreviewEnabled;
+        private RegistryPreviewSettings _settings;
 
         public void RefreshEnabledState()
         {
             InitializeEnabledValue();
             OnPropertyChanged(nameof(IsRegistryPreviewEnabled));
         }
+
+        private void NotifySettingsChanged()
+        {
+            // Using InvariantCulture as this is an IPC message
+            SendConfigMSG(
+                   string.Format(
+                       CultureInfo.InvariantCulture,
+                       "{{ \"powertoys\": {{ \"{0}\": {1} }} }}",
+                       RegistryPreviewSettings.ModuleName,
+                       JsonSerializer.Serialize(_settings)));
+        }
     }
 }

src/settings-ui/Settings.UI/Views/RegistryPreviewPage.xaml

@@ -11,11 +11,9 @@
     AutomationProperties.LandmarkType="Main"
     mc:Ignorable="d">
 
-    <controls:SettingsPageControl
-        x:Uid="RegistryPreview"
-        ModuleImageSource="ms-appx:///Assets/Modules/RegistryPreview.png">
+    <controls:SettingsPageControl x:Uid="RegistryPreview" ModuleImageSource="ms-appx:///Assets/Modules/RegistryPreview.png">
         <controls:SettingsPageControl.ModuleContent>
-            <StackPanel Orientation="Vertical" ChildrenTransitions="{StaticResource SettingsCardsAnimations}">
+            <StackPanel ChildrenTransitions="{StaticResource SettingsCardsAnimations}" Orientation="Vertical">
                 <labs:SettingsCard
                     x:Uid="RegistryPreview_Enable_RegistryPreview"
                     HeaderIcon="{ui:BitmapIcon Source=/Assets/FluentIcons/FluentIconsRegistryPreview.png}"
@@ -40,15 +38,17 @@
                         HeaderIcon="{ui:FontIcon FontFamily={StaticResource SymbolThemeFontFamily},
                                                  Glyph=&#xEA37;}"
                         IsClickEnabled="True" />
+
+                    <labs:SettingsCard x:Uid="RegistryPreview_DefaultRegApp" HeaderIcon="{ui:FontIcon FontFamily={StaticResource SymbolThemeFontFamily}, Glyph=&#xE7AC;}">
+                        <ToggleSwitch x:Uid="RegistryPreview_DefaultRegApp_ToggleSwitch" IsOn="{x:Bind Mode=TwoWay, Path=ViewModel.IsRegistryPreviewDefaultRegApp}" />
+                    </labs:SettingsCard>
                 </controls:SettingsGroup>
 
             </StackPanel>
         </controls:SettingsPageControl.ModuleContent>
-        
+
         <controls:SettingsPageControl.PrimaryLinks>
-            <controls:PageLink
-                x:Uid="LearnMore_RegistryPreview"
-                Link="https://aka.ms/PowerToysOverview_RegistryPreview" />
+            <controls:PageLink x:Uid="LearnMore_RegistryPreview" Link="https://aka.ms/PowerToysOverview_RegistryPreview" />
         </controls:SettingsPageControl.PrimaryLinks>
     </controls:SettingsPageControl>
 </Page>

src/settings-ui/Settings.UI/Views/RegistryPreviewPage.xaml.cs

@@ -16,7 +16,10 @@ namespace Microsoft.PowerToys.Settings.UI.Views
         public RegistryPreviewPage()
         {
             var settingsUtils = new SettingsUtils();
-            ViewModel = new RegistryPreviewViewModel(SettingsRepository<GeneralSettings>.GetInstance(settingsUtils), ShellPage.SendDefaultIPCMessage);
+            ViewModel = new RegistryPreviewViewModel(
+                SettingsRepository<GeneralSettings>.GetInstance(settingsUtils),
+                SettingsRepository<RegistryPreviewSettings>.GetInstance(settingsUtils),
+                ShellPage.SendDefaultIPCMessage);
             DataContext = ViewModel;
             InitializeComponent();
         }