//工具啟動路徑  string toolPath = System.Windows.Forms.Application.StartupPath + "http://郵件小工具.exe";  string extension = SptdConst.FileExtension;  string fileType = "Email File";  string fileContent = "text/plain";  //獲取信息  Microsoft.Win32.RegistryKey registryKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(extension);  if (registryKey != null && registryKey.OpenSubKey("shell") != null && registryKey.OpenSubKey("shell").OpenSubKey("open") != null &&    registryKey.OpenSubKey("shell").OpenSubKey("open").OpenSubKey("command") != null)  {    var varSub = registryKey.OpenSubKey("shell").OpenSubKey("open").OpenSubKey("command");    var varValue = varSub.GetValue("");    if (Object.Equals(varValue, toolPath + " %1"))    {      return;    }  }  //刪除  Microsoft.Win32.Registry.ClassesRoot.DeleteSubKeyTree(extension, false);  //文件注冊  registryKey = Microsoft.Win32.Registry.ClassesRoot.CreateSubKey(extension);  registryKey.SetValue("文件類型", fileType);  registryKey.SetValue("Content Type", fileContent);  //設置默認圖標  Microsoft.Win32.RegistryKey iconKey = registryKey.CreateSubKey("DefaultIcon");  iconKey.SetValue("", System.Windows.Forms.Application.StartupPath + "http://logo.ico");  //設置默認打開程序路徑  registryKey = registryKey.CreateSubKey("shell//open//command");  registryKey.SetValue("", toolPath + " %1");  //關閉  registryKey.Close();

//雙擊啟動打開 //如果原有路徑中存在空格，則會分解成多個元素if (e.Args.Length > 0){   string filePath = String.Join(" ", e.Args.ToArray());   FileInfo file = new FileInfo(filePath);   if (file.Exists)    {      EmailToolConst.DoubleClickSptdFilePath = file.FullName;    } }