/// <summary>
        /// 更新指定文件类型关联信息
        /// </summary>
        public static bool UpdateFileTypeRegInfo(FileTypeRegInfo regInfo)
        {
            if (!FileTypeRegistered(regInfo.ExtendName))
            {
                return(false);
            }

            string      extendName   = regInfo.ExtendName;
            string      relationName = extendName.Substring(1, extendName.Length - 1).ToUpper() + "_FileType";
            RegistryKey relationKey  = Registry.ClassesRoot.OpenSubKey(relationName, true);

            relationKey.SetValue("", regInfo.Description);
            RegistryKey iconKey = relationKey.OpenSubKey("DefaultIcon", true);

            iconKey.SetValue("", regInfo.IconPath);
            RegistryKey shellKey   = relationKey.OpenSubKey("Shell");
            RegistryKey openKey    = shellKey.OpenSubKey("Open");
            RegistryKey commandKey = openKey.OpenSubKey("Command", true);

            commandKey.SetValue("", regInfo.ExePath + " %1");
            relationKey.Close();
            return(true);
        }
        /// <summary>
        /// 获取指定文件类型关联信息
        /// </summary>
        public static FileTypeRegInfo GetFileTypeRegInfo(string extendName)
        {
            if (!FileTypeRegistered(extendName))
            {
                return(null);
            }
            FileTypeRegInfo regInfo = new FileTypeRegInfo(extendName);

            string      relationName = extendName.Substring(1, extendName.Length - 1).ToUpper() + "_FileType";
            RegistryKey relationKey  = Registry.ClassesRoot.OpenSubKey(relationName);

            regInfo.Description = relationKey.GetValue("").ToString();
            RegistryKey iconKey = relationKey.OpenSubKey("DefaultIcon");

            regInfo.IconPath = iconKey.GetValue("").ToString();
            RegistryKey shellKey   = relationKey.OpenSubKey("Shell");
            RegistryKey openKey    = shellKey.OpenSubKey("Open");
            RegistryKey commandKey = openKey.OpenSubKey("Command");
            string      temp       = commandKey.GetValue("").ToString();

            regInfo.ExePath = temp.Substring(0, temp.Length - 3);
            return(regInfo);
        }
        /// <summary>
        /// 使文件类型与对应的图标及应用程序关联起来
        /// </summary>
        public static void RegisterFileType(FileTypeRegInfo regInfo)
        {
            if (FileTypeRegistered(regInfo.ExtendName))
            {
                return;
            }

            //HKEY_CLASSES_ROOT/.osf
            RegistryKey fileTypeKey  = Registry.ClassesRoot.CreateSubKey(regInfo.ExtendName);
            string      relationName = regInfo.ExtendName.Substring(1,
                                                                    regInfo.ExtendName.Length - 1).ToUpper() + "_FileType";

            fileTypeKey.SetValue("", relationName);
            fileTypeKey.Close();

            //HKEY_CLASSES_ROOT/OSF_FileType
            RegistryKey relationKey = Registry.ClassesRoot.CreateSubKey(relationName);

            relationKey.SetValue("", regInfo.Description);

            //HKEY_CLASSES_ROOT/OSF_FileType/Shell/DefaultIcon
            RegistryKey iconKey = relationKey.CreateSubKey("DefaultIcon");

            iconKey.SetValue("", regInfo.IconPath);

            //HKEY_CLASSES_ROOT/OSF_FileType/Shell
            RegistryKey shellKey = relationKey.CreateSubKey("Shell");

            //HKEY_CLASSES_ROOT/OSF_FileType/Shell/Open
            RegistryKey openKey = shellKey.CreateSubKey("Open");

            //HKEY_CLASSES_ROOT/OSF_FileType/Shell/Open/Command
            RegistryKey commandKey = openKey.CreateSubKey("Command");

            commandKey.SetValue("", regInfo.ExePath + " %1"); // " %1"表示将被双击的文件的路径传给目标应用程序
            relationKey.Close();
        }