From 3abbd64ff9a1f6c59af2f205a86378406b5eb352 Mon Sep 17 00:00:00 2001
From: jchas2 <jchas2@icloud.com>
Date: Sat, 8 Aug 2026 10:32:17 +1000
Subject: [PATCH] Win marketing name. Closes #45

---
 src/Task.Monitor.System/SystemInfo.Windows.cs | 37 +++++++++++++++++--
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/src/Task.Monitor.System/SystemInfo.Windows.cs b/src/Task.Monitor.System/SystemInfo.Windows.cs
index 9ee6dcc..090bd6f 100644
--- a/src/Task.Monitor.System/SystemInfo.Windows.cs
+++ b/src/Task.Monitor.System/SystemInfo.Windows.cs
@@ -109,8 +109,6 @@ private static bool GetGpuCoresInternal(ref SystemStatistics systemStatistics)
         return true;
     }
 
-    private static string GetOsVersionInternal() => Environment.OSVersion.VersionString;
-
     private static bool GetGpuMemoryInternalTotal(ref SystemStatistics systemStatistics)
     {
         // NVIDIA + AMD GPUs store memory info in the display adapter key.
@@ -227,7 +225,40 @@ private static bool GetNetworkStatsInternal(ref NetworkStatistics networkStatist
         Pdh.PdhCloseQuery(hQuery);
         return true;
     }
-    
+
+    private static string GetOsVersionInternal()
+    {
+        // Windows product/display name determination is a real mess. 
+        const string RegPath = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion";
+        const string WINDOWS_10  = "Windows 10";
+        const string WINDOWS_11  = "Windows 11";
+        using RegistryKey? key = Registry.LocalMachine.OpenSubKey(RegPath);
+
+        if (key == null) {
+            return Environment.OSVersion.VersionString;
+        }
+
+        string productName = key.GetValue("ProductName") as string ?? string.Empty;
+        string displayVersion = key.GetValue("DisplayVersion") as string ?? string.Empty;
+        string currBuildNumber = key.GetValue("CurrentBuildNumber") as string ?? string.Empty;
+
+        if (!string.IsNullOrEmpty(productName)) {
+            if (int.TryParse(currBuildNumber, out int buildNumber) && buildNumber >= 22000) {
+                // Fix up issue where Win 10 -> Win 11 upgrade does not update ProductName in Registry.
+                if (productName.Contains(WINDOWS_10, StringComparison.OrdinalIgnoreCase)) {
+                    productName = productName.Replace(WINDOWS_10, WINDOWS_11, StringComparison.OrdinalIgnoreCase);
+                }
+            }
+
+            return string.IsNullOrWhiteSpace(displayVersion) 
+                ? productName 
+                : $"{productName} {displayVersion}";
+        }
+        
+        // For older versions of Windows.
+        return Environment.OSVersion.VersionString;        
+    }
+
     private static unsafe bool GetSystemMemoryInternal(ref SystemStatistics systemStatistics)
     {
         systemStatistics.AvailablePageFile = 0;