Add plugin icon registration and include QLPlugin.ico

QuickLook/App.xaml.cs

@@ -235,6 +235,8 @@ public partial class App : Application
         MessageBoxPatcher.Initialize();
 
         CheckUpdate();
+
+        CheckAndRegisterPluginIcon();
     }
 
     protected virtual void OnSessionEnding(object sender, SessionEndingEventArgs e)
@@ -317,7 +319,7 @@ public partial class App : Application
                 // Invalid path, continue to show duplicate message
             }
         }
-        
+
         // Second instance: duplicate
         MessageBox.Show(TranslationHelper.Get("APP_SECOND_TEXT"), TranslationHelper.Get("APP_SECOND"),
             MessageBoxButton.OK, MessageBoxImage.Information);
@@ -337,6 +339,11 @@ public partial class App : Application
         SettingHelper.Set("LastUpdateTicks", DateTime.Now.Ticks);
     }
 
+    private void CheckAndRegisterPluginIcon()
+    {
+        _ = Task.Delay(3000).ContinueWith(_ => PluginIconRegistrationHelper.CheckAndRegisterPluginIcon());
+    }
+
     private void RunListener(StartupEventArgs e)
     {
         TrayIconManager.GetInstance();

QuickLook/Helpers/PluginIconRegistrationHelper.cs

@@ -0,0 +1,114 @@
+// Copyright © 2017-2026 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using Microsoft.Win32;
+using QuickLook.Common.Helpers;
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Security.Principal;
+
+namespace QuickLook.Helpers;
+
+internal static class PluginIconRegistrationHelper
+{
+    internal static void CheckAndRegisterPluginIcon()
+    {
+        try
+        {
+            var isElevated = new WindowsPrincipal(WindowsIdentity.GetCurrent())
+                .IsInRole(WindowsBuiltInRole.Administrator);
+            if (!isElevated)
+                return;
+
+            var iconPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "QLPlugin.ico");
+            if (!File.Exists(iconPath))
+                return;
+
+            bool changed = false;
+
+            // Computer\HKEY_CLASSES_ROOT\.qlplugin
+            using (var key = Registry.ClassesRoot.CreateSubKey(".qlplugin", true))
+            {
+                if (key != null)
+                {
+                    if (key.GetValue(string.Empty) as string != "QuickLook.Plugin")
+                    {
+                        key.SetValue(string.Empty, "QuickLook.Plugin");
+                        changed = true;
+                    }
+
+                    if (key.GetValue("PerceivedType") as string != "compressed")
+                    {
+                        key.SetValue("PerceivedType", "compressed");
+                        changed = true;
+                    }
+                }
+            }
+
+            // Computer\HKEY_CLASSES_ROOT\QuickLook.Plugin\DefaultIcon
+            using (var key = Registry.ClassesRoot.CreateSubKey(@"QuickLook.Plugin\DefaultIcon", true))
+            {
+                var iconValue = $"{iconPath},0";
+                if (key != null && key.GetValue("") as string != iconValue)
+                {
+                    key.SetValue("", iconValue);
+                    changed = true;
+                }
+            }
+
+            // Computer\HKEY_CLASSES_ROOT\QuickLook.Plugin
+            using (var key = Registry.ClassesRoot.CreateSubKey("QuickLook.Plugin", true))
+            {
+                const string fileTypeName = "QuickLook Plugin File";
+                if (key != null && key.GetValue(string.Empty) as string != fileTypeName)
+                {
+                    key.SetValue(string.Empty, fileTypeName);
+                    changed = true;
+                }
+            }
+
+            // Computer\HKEY_CLASSES_ROOT\QuickLook.Plugin\shell\open\command
+            using (var key = Registry.ClassesRoot.CreateSubKey(@"QuickLook.Plugin\shell\open\command", true))
+            {
+                var commandValue = $"\"{App.AppFullPath}\" \"%1\"";
+                if (key != null && key.GetValue(string.Empty) as string != commandValue)
+                {
+                    key.SetValue(string.Empty, commandValue);
+                    changed = true;
+                }
+            }
+
+            // Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.qlplugin
+            {
+                // It is left to the user to choose whether to restore the default option in the future
+            }
+
+            if (changed)
+            {
+                SHChangeNotify(0x08000000, 0x0000, IntPtr.Zero, IntPtr.Zero); // SHCNE_ASSOCCHANGED
+            }
+        }
+        catch (Exception ex)
+        {
+            ProcessHelper.WriteLog(ex.ToString());
+        }
+    }
+
+    [DllImport("shell32.dll", SetLastError = true)]
+    private static extern void SHChangeNotify(int wEventId, uint uFlags, IntPtr dwItem1, IntPtr dwItem2);
+}

QuickLook/QuickLook.csproj

@@ -136,6 +136,13 @@
         </None>
     </ItemGroup>
 
+    <ItemGroup>
+        <Content Include="..\QLPlugin.ico">
+            <Link>QLPlugin.ico</Link>
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </Content>
+    </ItemGroup>
+
     <ItemGroup>
         <ProjectReference Include="..\QuickLook.Common\QuickLook.Common.csproj">
             <Project>{85FDD6BA-871D-46C8-BD64-F6BB0CB5EA95}</Project>

README.md

@@ -790,7 +790,8 @@ Interested in contributing? Check out our development resources:
 
 [@OiCkilL](https://twitter.com/OiCkilL)
 [@QubitsDev](https://twitter.com/qubitsdev)
-[Donno](https://github.com/Donnnno)
+[@Donno](https://github.com/Donnnno)
+[@Shomnipotence](https://github.com/Shomnipotence)
 
 *Fluent UI & Icons*