.

src/DiffEngineTray/GlobalUsings.cs

@@ -0,0 +1,3 @@
+// Global using directives
+
+global using Microsoft.Win32;

src/DiffEngineTray/Program.cs

@@ -69,6 +69,7 @@ static async Task Inner()
 
         icon.ContextMenuStrip = menuStrip;
 
+        TrayIcon.Promoted();
         Application.Run();
         tokenSource.Cancel();
         await task;

src/DiffEngineTray/Startup.cs

@@ -1,6 +1,4 @@
-using Microsoft.Win32;
-
-public class Startup
+public class Startup
 {
     public static void Add()
     {

src/DiffEngineTray/TrayIcon.cs

@@ -0,0 +1,36 @@
+public static class TrayIcon
+{
+    public static void Promoted()
+    {
+        //C:\Users\SimonCropp\.dotnet\tools\DiffEngineTray.exe
+        var profileDirectory = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+        var exePath = Path.Combine(profileDirectory, @"dotnet\tools\DiffEngineTray.exe");
+        using var iconSettingsKey = Registry.CurrentUser.OpenSubKey(@"Control Panel\NotifyIconSettings");
+        if (iconSettingsKey == null)
+        {
+            DiffEngine.Logging.Write(@"NotifyIconSettings reg path returned null. Path: Control Panel\NotifyIconSettings");
+            return;
+        }
+
+        foreach (var subKeyName in iconSettingsKey.GetSubKeyNames())
+        {
+            using var iconKey = iconSettingsKey.OpenSubKey(subKeyName, true);
+            if (iconKey == null)
+            {
+                continue;
+            }
+
+            var valueNames = iconKey.GetValueNames();
+            if (!valueNames.Contains("ExecutablePath") ||
+                !string.Equals((string?) iconKey.GetValue("ExecutablePath"), exePath, StringComparison.OrdinalIgnoreCase))
+            {
+                continue;
+            }
+
+            iconKey.SetValue("IsPromoted", 1, RegistryValueKind.DWord);
+            return;
+        }
+
+        DiffEngine.Logging.Write(@"DiffEngineTray.exe not found in NotifyIconSettings. Path: Control Panel\NotifyIconSettings");
+    }
+}