diff --git a/shadowsocks-csharp/Data/sysproxy.exe.gz b/shadowsocks-csharp/Data/sysproxy.exe.gz
deleted file mode 100644
index 980d304b..00000000
Binary files a/shadowsocks-csharp/Data/sysproxy.exe.gz and /dev/null differ
diff --git a/shadowsocks-csharp/Data/sysproxy64.exe.gz b/shadowsocks-csharp/Data/sysproxy64.exe.gz
deleted file mode 100644
index c5ff36af..00000000
Binary files a/shadowsocks-csharp/Data/sysproxy64.exe.gz and /dev/null differ
diff --git a/shadowsocks-csharp/Properties/Resources.resx b/shadowsocks-csharp/Properties/Resources.resx
index 253c66c0..847eb7a7 100755
--- a/shadowsocks-csharp/Properties/Resources.resx
+++ b/shadowsocks-csharp/Properties/Resources.resx
@@ -151,12 +151,6 @@
   <data name="ssw128" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\ssw128.png;System.Drawing.Bitmap, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
-  <data name="sysproxy64_exe" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\Data\sysproxy64.exe.gz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
-  </data>
-  <data name="sysproxy_exe" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\Data\sysproxy.exe.gz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
-  </data>
   <data name="user_rule" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\data\user-rule.txt;System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089;utf-8</value>
   </data>
diff --git a/shadowsocks-csharp/Util/SystemProxy/Sysproxy.cs b/shadowsocks-csharp/Util/SystemProxy/Sysproxy.cs
deleted file mode 100644
index b1ffcac4..00000000
--- a/shadowsocks-csharp/Util/SystemProxy/Sysproxy.cs
+++ /dev/null
@@ -1,291 +0,0 @@
-using Newtonsoft.Json;
-using NLog;
-using Shadowsocks.Controller;
-using Shadowsocks.Model;
-using Shadowsocks.Properties;
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.IO;
-using System.Linq;
-using System.Text;
-using System.Threading;
-
-namespace Shadowsocks.Util.SystemProxy
-{
-    public static class Sysproxy
-    {
-        private static Logger logger = LogManager.GetCurrentClassLogger();
-
-        private const string _userWininetConfigFile = "user-wininet.json";
-
-        private readonly static string[] _lanIP = {
-            "<local>",
-            "localhost",
-            "127.*",
-            "10.*",
-            "172.16.*",
-            "172.17.*",
-            "172.18.*",
-            "172.19.*",
-            "172.20.*",
-            "172.21.*",
-            "172.22.*",
-            "172.23.*",
-            "172.24.*",
-            "172.25.*",
-            "172.26.*",
-            "172.27.*",
-            "172.28.*",
-            "172.29.*",
-            "172.30.*",
-            "172.31.*",
-            "192.168.*"
-            };
-
-
-        private static string _queryStr;
-
-        // In general, this won't change
-        // format:
-        //  <flags><CR-LF>
-        //  <proxy-server><CR-LF>
-        //  <bypass-list><CR-LF>
-        //  <pac-url>
-        private static SysproxyConfig _userSettings = null;
-
-        enum RET_ERRORS : int
-        {
-            RET_NO_ERROR = 0,
-            INVALID_FORMAT = 1,
-            NO_PERMISSION = 2,
-            SYSCALL_FAILED = 3,
-            NO_MEMORY = 4,
-            INVAILD_OPTION_COUNT = 5,
-        };
-
-        static Sysproxy()
-        {
-            try
-            {
-                FileManager.UncompressFile(Utils.GetTempPath("sysproxy.exe"),
-                    Environment.Is64BitOperatingSystem ? Resources.sysproxy64_exe : Resources.sysproxy_exe);
-            }
-            catch (IOException e)
-            {
-                logger.LogUsefulException(e);
-            }
-        }
-
-        public static void SetIEProxy(bool enable, bool global, string proxyServer, string pacURL)
-        {
-            Read();
-
-            if (!_userSettings.UserSettingsRecorded)
-            {
-                // record user settings
-                ExecSysproxy("query");
-                ParseQueryStr(_queryStr);
-            }
-
-            string arguments;
-            if (enable)
-            {
-                string customBypassString = _userSettings.BypassList ?? "";
-                List<string> customBypassList = new List<string>(customBypassString.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries));
-                customBypassList.AddRange(_lanIP);
-                string[] realBypassList = customBypassList.Distinct().ToArray();
-                string realBypassString = string.Join(";", realBypassList);
-
-                arguments = global
-                    ? $"global {proxyServer} {realBypassString}"
-                    : $"pac {pacURL}";
-            }
-            else
-            {
-                // restore user settings
-                var flags = _userSettings.Flags;
-                var proxy_server = _userSettings.ProxyServer ?? "-";
-                var bypass_list = _userSettings.BypassList ?? "-";
-                var pac_url = _userSettings.PacUrl ?? "-";
-                arguments = $"set {flags} {proxy_server} {bypass_list} {pac_url}";
-
-                // have to get new settings
-                _userSettings.UserSettingsRecorded = false;
-            }
-
-            Save();
-            ExecSysproxy(arguments);
-        }
-
-        // set system proxy to 1 (null) (null) (null)
-        public static bool ResetIEProxy()
-        {
-            try
-            {
-                // clear user-wininet.json
-                _userSettings = new SysproxyConfig();
-                Save();
-                // clear system setting
-                ExecSysproxy("set 1 - - -");
-            }
-            catch (Exception)
-            {
-                return false;
-            }
-
-            return true;
-        }
-
-        private static void ExecSysproxy(string arguments)
-        {
-            // using event to avoid hanging when redirect standard output/error
-            // ref: https://stackoverflow.com/questions/139593/processstartinfo-hanging-on-waitforexit-why
-            // and http://blog.csdn.net/zhangweixing0/article/details/7356841
-            using (AutoResetEvent outputWaitHandle = new AutoResetEvent(false))
-            using (AutoResetEvent errorWaitHandle = new AutoResetEvent(false))
-            {
-                using (var process = new Process())
-                {
-                    // Configure the process using the StartInfo properties.
-                    process.StartInfo.FileName = Utils.GetTempPath("sysproxy.exe");
-                    process.StartInfo.Arguments = arguments;
-                    process.StartInfo.WorkingDirectory = Utils.GetTempPath();
-                    process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
-                    process.StartInfo.UseShellExecute = false;
-                    process.StartInfo.RedirectStandardError = true;
-                    process.StartInfo.RedirectStandardOutput = true;
-
-                    // Need to provide encoding info, or output/error strings we got will be wrong.
-                    process.StartInfo.StandardOutputEncoding = Encoding.Unicode;
-                    process.StartInfo.StandardErrorEncoding = Encoding.Unicode;
-
-                    process.StartInfo.CreateNoWindow = true;
-
-                    StringBuilder output = new StringBuilder();
-                    StringBuilder error = new StringBuilder();
-
-                    process.OutputDataReceived += (sender, e) =>
-                    {
-                        if (e.Data == null)
-                        {
-                            outputWaitHandle.Set();
-                        }
-                        else
-                        {
-                            output.AppendLine(e.Data);
-                        }
-                    };
-                    process.ErrorDataReceived += (sender, e) =>
-                    {
-                        if (e.Data == null)
-                        {
-                            errorWaitHandle.Set();
-                        }
-                        else
-                        {
-                            error.AppendLine(e.Data);
-                        }
-                    };
-                    try
-                    {
-                        process.Start();
-
-                        process.BeginErrorReadLine();
-                        process.BeginOutputReadLine();
-
-                        process.WaitForExit();
-                    }
-                    catch (System.ComponentModel.Win32Exception e)
-                    {
-                        // log the arguments
-                        throw new ProxyException(ProxyExceptionType.FailToRun, process.StartInfo.Arguments, e);
-                    }
-                    var stderr = error.ToString();
-                    var stdout = output.ToString();
-
-                    var exitCode = process.ExitCode;
-                    if (exitCode != (int)RET_ERRORS.RET_NO_ERROR)
-                    {
-                        throw new ProxyException(ProxyExceptionType.SysproxyExitError, stderr);
-                    }
-
-                    if (arguments == "query")
-                    {
-                        if (stdout.IsNullOrWhiteSpace() || stdout.IsNullOrEmpty())
-                        {
-                            // we cannot get user settings
-                            throw new ProxyException(ProxyExceptionType.QueryReturnEmpty);
-                        }
-                        _queryStr = stdout;
-                    }
-                }
-            }
-        }
-
-        private static void Save()
-        {
-            try
-            {
-                using (StreamWriter sw = new StreamWriter(File.Open(Utils.GetTempPath(_userWininetConfigFile), FileMode.Create)))
-                {
-                    string jsonString = JsonConvert.SerializeObject(_userSettings, Formatting.Indented);
-                    sw.Write(jsonString);
-                    sw.Flush();
-                }
-            }
-            catch (IOException e)
-            {
-                logger.LogUsefulException(e);
-            }
-        }
-
-        private static void Read()
-        {
-            try
-            {
-                string configContent = File.ReadAllText(Utils.GetTempPath(_userWininetConfigFile));
-                _userSettings = JsonConvert.DeserializeObject<SysproxyConfig>(configContent);
-            }
-            catch (Exception)
-            {
-                // Suppress all exceptions. finally block will initialize new user config settings.
-            }
-            finally
-            {
-                if (_userSettings == null) _userSettings = new SysproxyConfig();
-            }
-        }
-
-        private static void ParseQueryStr(string str)
-        {
-            string[] userSettingsArr = str.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
-
-            // sometimes sysproxy output in utf16le instead of ascii
-            // manually translate it
-            if (userSettingsArr.Length != 4)
-            {
-                byte[] strByte = Encoding.ASCII.GetBytes(str);
-                str = Encoding.Unicode.GetString(strByte);
-                userSettingsArr = str.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
-                // still fail, throw exception with string hexdump
-                if (userSettingsArr.Length != 4)
-                {
-                    throw new ProxyException(ProxyExceptionType.QueryReturnMalformed, BitConverter.ToString(strByte));
-                }
-            }
-
-            _userSettings.Flags = userSettingsArr[0];
-
-            // handle output from WinINET
-            if (userSettingsArr[1] == "(null)") _userSettings.ProxyServer = null;
-            else _userSettings.ProxyServer = userSettingsArr[1];
-            if (userSettingsArr[2] == "(null)") _userSettings.BypassList = null;
-            else _userSettings.BypassList = userSettingsArr[2];
-            if (userSettingsArr[3] == "(null)") _userSettings.PacUrl = null;
-            else _userSettings.PacUrl = userSettingsArr[3];
-
-            _userSettings.UserSettingsRecorded = true;
-        }
-    }
-}
diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index 700ed4f9..b437a7d6 100644
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -29,8 +29,6 @@
     <None Remove="Data\NLog.config" />
     <None Remove="Data\privoxy.exe.gz" />
     <None Remove="Data\privoxy_conf.txt" />
-    <None Remove="Data\sysproxy.exe.gz" />
-    <None Remove="Data\sysproxy64.exe.gz" />
     <None Remove="Data\user-rule.txt" />
     <None Remove="Resources\ss128.pdn" />
     <None Remove="Resources\ss32.pdn" />
@@ -92,8 +90,6 @@
     <Resource Include="Data\NLog.config" />
     <Resource Include="Data\privoxy.exe.gz" />
     <Resource Include="Data\privoxy_conf.txt" />
-    <Resource Include="Data\sysproxy.exe.gz" />
-    <Resource Include="Data\sysproxy64.exe.gz" />
     <Resource Include="Data\user-rule.txt" />
     <Resource Include="Resources\ss128.pdn" />
     <Resource Include="Resources\ss32.pdn" />