diff --git a/PortProxyGUI/PortProxyGUI.cs b/PortProxyGUI/PortProxyGUI.cs
index 2722ab1..6e797b1 100644
--- a/PortProxyGUI/PortProxyGUI.cs
+++ b/PortProxyGUI/PortProxyGUI.cs
@@ -63,7 +63,7 @@ namespace PortProxyGUI
                 try
                 {
                     var rule = ParseRule(item);
-                    CmdUtil.AddOrUpdateProxy(rule);
+                    PortProxyUtil.AddOrUpdateProxy(rule);
                 }
                 catch (NotSupportedException ex)
                 {
@@ -83,7 +83,7 @@ namespace PortProxyGUI
                 try
                 {
                     var rule = ParseRule(item);
-                    CmdUtil.DeleteProxy(rule);
+                    PortProxyUtil.DeleteProxy(rule);
                 }
                 catch (NotSupportedException ex)
                 {
@@ -173,7 +173,7 @@ namespace PortProxyGUI
 
         public void RefreshProxyList()
         {
-            var proxies = CmdUtil.GetProxies();
+            var proxies = PortProxyUtil.GetProxies();
             var rules = Program.SqliteDbScope.Rules.ToArray();
             foreach (var proxy in proxies)
             {
diff --git a/PortProxyGUI/PortProxyGUI.csproj b/PortProxyGUI/PortProxyGUI.csproj
index abb7977..5147f69 100644
--- a/PortProxyGUI/PortProxyGUI.csproj
+++ b/PortProxyGUI/PortProxyGUI.csproj
@@ -42,4 +42,4 @@
     <PackageReference Include="SQLib.Sqlite" Version="0.8.6" />
   </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>
diff --git a/PortProxyGUI/SetProxy.cs b/PortProxyGUI/SetProxy.cs
index 8a32394..1020ae2 100644
--- a/PortProxyGUI/SetProxy.cs
+++ b/PortProxyGUI/SetProxy.cs
@@ -116,17 +116,17 @@ namespace PortProxyGUI
             if (_updateMode)
             {
                 var oldRule = Program.SqliteDbScope.GetRule(_itemRule.Type, _itemRule.ListenOn, _itemRule.ListenPort);
-                CmdUtil.DeleteProxy(oldRule);
+                PortProxyUtil.DeleteProxy(oldRule);
                 Program.SqliteDbScope.Remove(oldRule);
 
-                CmdUtil.AddOrUpdateProxy(rule);
+                PortProxyUtil.AddOrUpdateProxy(rule);
                 Program.SqliteDbScope.Add(rule);
 
                 ParentWindow.UpdateListViewItem(_listViewItem, rule, 1);
             }
             else
             {
-                CmdUtil.AddOrUpdateProxy(rule);
+                PortProxyUtil.AddOrUpdateProxy(rule);
                 Program.SqliteDbScope.Add(rule);
 
                 ParentWindow.RefreshProxyList();
diff --git a/PortProxyGUI/~DS/CmdRunner.cs b/PortProxyGUI/~DS/CmdRunner.cs
index 5d3c62e..bb75e0c 100644
--- a/PortProxyGUI/~DS/CmdRunner.cs
+++ b/PortProxyGUI/~DS/CmdRunner.cs
@@ -1,7 +1,9 @@
-using System.Diagnostics;
+using System;
+using System.Diagnostics;
 
 namespace PortProxyGUI
 {
+    [Obsolete("The method of creating a new process is no longer used.")]
     public static class CmdRunner
     {
         public static string Execute(string cmd)
diff --git a/PortProxyGUI/~DS/CmdUtil.cs b/PortProxyGUI/~DS/CmdUtil.cs
index fbab17d..6f85802 100644
--- a/PortProxyGUI/~DS/CmdUtil.cs
+++ b/PortProxyGUI/~DS/CmdUtil.cs
@@ -7,6 +7,7 @@ using System.Text.RegularExpressions;
 
 namespace PortProxyGUI
 {
+    [Obsolete("The method of creating a new process is no longer used.", true)]
     public static class CmdUtil
     {
         private static Regex GetRegex(string fromType, string toType)
diff --git a/PortProxyGUI/~DS/PortProxyUtil.cs b/PortProxyGUI/~DS/PortProxyUtil.cs
new file mode 100644
index 0000000..b7fd22a
--- /dev/null
+++ b/PortProxyGUI/~DS/PortProxyUtil.cs
@@ -0,0 +1,71 @@
+using Microsoft.Win32;
+using PortProxyGUI.Data;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace PortProxyGUI
+{
+    public static class PortProxyUtil
+    {
+        private static InvalidOperationException InvalidPortProxyType(string type) => new($"Invalid port proxy type ({type}).");
+        private static readonly string[] ProxyTypes = new[] { "v4tov4", "v4tov6", "v6tov4", "v6tov6" };
+
+        public static Rule[] GetProxies()
+        {
+            var ruleList = new List<Rule>();
+            foreach (var type in ProxyTypes)
+            {
+                var keyName = $@"SYSTEM\ControlSet001\Services\PortProxy\{type}\tcp";
+                var key = Registry.LocalMachine.OpenSubKey(keyName);
+
+                if (key is not null)
+                {
+                    foreach (var name in key.GetValueNames())
+                    {
+                        var listenParts = name.Split('/');
+                        var listenOn = listenParts[0];
+                        if (!int.TryParse(listenParts[1], out var listenPort)) continue;
+
+                        var connectParts = key.GetValue(name).ToString().Split('/');
+                        var connectTo = connectParts[0];
+                        if (!int.TryParse(connectParts[1], out var connectPort)) continue;
+
+                        ruleList.Add(new Rule
+                        {
+                            Type = type,
+                            ListenOn = listenOn,
+                            ListenPort = listenPort,
+                            ConnectTo = connectTo,
+                            ConnectPort = connectPort,
+                        });
+                    }
+                }
+            }
+            return ruleList.ToArray();
+        }
+
+        public static void AddOrUpdateProxy(Rule rule)
+        {
+            if (!ProxyTypes.Contains(rule.Type)) throw InvalidPortProxyType(rule.Type);
+
+            var keyName = $@"SYSTEM\ControlSet001\Services\PortProxy\{rule.Type}\tcp";
+            var key = Registry.LocalMachine.OpenSubKey(keyName, true);
+            var valueName = $"{rule.ListenOn}/{rule.ListenPort}";
+            var value = $"{rule.ConnectTo}/{rule.ConnectPort}";
+
+            key.SetValue(valueName, value);
+        }
+
+        public static void DeleteProxy(Rule rule)
+        {
+            if (!ProxyTypes.Contains(rule.Type)) throw InvalidPortProxyType(rule.Type);
+
+            var keyName = $@"SYSTEM\ControlSet001\Services\PortProxy\{rule.Type}\tcp";
+            var key = Registry.LocalMachine.OpenSubKey(keyName, true);
+            var valueName = $"{rule.ListenOn}/{rule.ListenPort}";
+
+            key.DeleteValue(valueName);
+        }
+    }
+}