diff --git a/Gtkmm3/gtk138_cfgconverter/.vscode/settings.json b/Gtkmm3/gtk138_cfgconverter/.vscode/settings.json
new file mode 100644
index 0000000..da712a3
--- /dev/null
+++ b/Gtkmm3/gtk138_cfgconverter/.vscode/settings.json
@@ -0,0 +1,6 @@
+{
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
+    "files.associations": {
+        "iostream": "cpp"
+    }
+}
\ No newline at end of file
diff --git a/Gtkmm3/gtk138_cfgconverter/CMakeLists.txt b/Gtkmm3/gtk138_cfgconverter/CMakeLists.txt
new file mode 100644
index 0000000..39336d6
--- /dev/null
+++ b/Gtkmm3/gtk138_cfgconverter/CMakeLists.txt
@@ -0,0 +1,72 @@
+set(CMAKE_CXX_STANDARD 17)
+cmake_minimum_required(VERSION 3.0.0)
+project(gtk138_cfgconvert VERSION 1.0.0)
+
+list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/../../GCR_CMake/macros)
+include(GlibCompileResourcesSupport)
+
+include(CTest)
+enable_testing()
+
+set(CPACK_PROJECT_NAME ${PROJECT_NAME})
+set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
+
+include(CPack)
+include_directories(.)
+include_directories(..)
+
+#Find PkgConfig to use gtkmm3
+find_package (PkgConfig REQUIRED)
+pkg_check_modules (GTKMM3 REQUIRED gtkmm-3.0)
+include_directories (${GTKMM3_INCLUDE_DIRS})
+link_directories (${GTKMM3_LIBRARY_DIRS})
+
+#Find Gettext
+find_package (Gettext REQUIRED)
+set(PO_DIR ${CMAKE_BINARY_DIR}/po/zh_CN/LC_MESSAGES)
+
+#Source files
+set(SOURCE_FILE src/main.cc src/CfgConvert.cc ../cfgfile2/cfgfile.cc)
+
+#Compile Resource
+
+# set(RESOURCE_LIST
+#     text_menu.xml)
+
+# compile_gresources(RESOURCE_FILE
+#                    XML_OUT
+#                    TYPE EMBED_C
+#                    RESOURCES ${RESOURCE_LIST}
+#                    PREFIX "/org/gtk/daleclack"
+#                    SOURCE_DIR ${PROJECT_SOURCE_DIR}/res)
+                   
+# Add a custom target to the makefile. Now make builds our resource file.
+# It depends on the output RESOURCE_FILE.
+
+# add_custom_target(resource ALL DEPENDS ${RESOURCE_FILE})
+
+#For win32 platform,use rc resource and .ico icon
+if(WIN32)
+	SET(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
+	set(app_WINRC ../icon.rc)
+	set_property(SOURCE ../icon.rc APPEND PROPERTY
+        OBJECT_DEPENDS ${PROJECT_SOURCE_DIR}/../icon.ico
+        )
+	add_executable(${PROJECT_NAME} WIN32 ${app_WINRC} ${SOURCE_FILE})
+    add_custom_command( TARGET ${PROJECT_NAME} 
+                        COMMAND echo * > ${CMAKE_BINARY_DIR}/.gitignore
+                        COMMAND echo **/* > ${CMAKE_BINARY_DIR}/.hgignore)
+else()
+	add_executable(${PROJECT_NAME} ${SOURCE_FILE})
+    add_custom_command( TARGET ${PROJECT_NAME}
+                        COMMAND echo \"*\" > ${CMAKE_BINARY_DIR}/.gitignore
+                        COMMAND echo \"**/*\" > ${CMAKE_BINARY_DIR}/.hgignore)   
+endif(WIN32)
+
+#Add command to generate .gitignore and .mo files
+# add_custom_command( TARGET ${PROJECT_NAME} 
+#                     COMMAND mkdir -p ${PO_DIR}
+#                     COMMAND ${GETTEXT_MSGFMT_EXECUTABLE} ${CMAKE_SOURCE_DIR}/po/zh_CN.po -o ${PO_DIR}/${PROJECT_NAME}.mo)
+
+SET (CMAKE_EXTRA_CXX_FLAGS ${GTKMM3_CFLAGS_OTHER})
+target_link_libraries (${PROJECT_NAME} ${GTKMM3_LIBRARIES} -lpthread)
diff --git a/Gtkmm3/gtk138_cfgconverter/src/CfgConvert.cc b/Gtkmm3/gtk138_cfgconverter/src/CfgConvert.cc
new file mode 100644
index 0000000..a7877c1
--- /dev/null
+++ b/Gtkmm3/gtk138_cfgconverter/src/CfgConvert.cc
@@ -0,0 +1,124 @@
+#include "CfgConvert.hh"
+#include <iostream>
+#include "../json_nlohmann/json.hpp"
+
+using json = nlohmann::json;
+
+CfgConvert::CfgConvert()
+    : main_box(Gtk::ORIENTATION_HORIZONTAL, 5),
+      btn_box(Gtk::ORIENTATION_VERTICAL, 5),
+      btnopen("Open cfg file"),
+      btnsave("Save json file")
+{
+    // Initalize window
+    set_default_size(800, 450);
+    set_title("Simple Config File Converter");
+    set_icon_name("org.gtk.daleclack");
+
+    // Create List Store
+    m_liststore = Gtk::ListStore::create(n_columns);
+    cfg_view.append_column("Key", n_columns.key);
+    cfg_view.append_column("Value", n_columns.value);
+    cfg_view.set_model(m_liststore);
+
+    // Pack Buttons
+    btn_box.pack_start(btnopen, Gtk::PACK_SHRINK);
+    btn_box.pack_start(btnsave, Gtk::PACK_SHRINK);
+    btn_box.set_valign(Gtk::ALIGN_CENTER);
+    btnopen.signal_clicked().connect(sigc::mem_fun(*this, &CfgConvert::btnopen_clicked));
+    btnsave.signal_clicked().connect(sigc::mem_fun(*this, &CfgConvert::btnsave_clicked));
+
+    // Pack Widgets
+    main_box.pack_start(cfg_view);
+    main_box.pack_start(btn_box, Gtk::PACK_SHRINK);
+    add(main_box);
+    show_all_children();
+}
+
+void CfgConvert::btnsave_clicked()
+{
+    // Create dialog
+    dialog = Gtk::FileChooserNative::create("Open Config File", *this,
+                                            Gtk::FILE_CHOOSER_ACTION_SAVE, "OK", "Cancel");
+    // Create filters
+    auto filter_any = Gtk::FileFilter::create();
+    filter_any->add_pattern("*");
+    filter_any->set_name("Any Config File");
+
+    dialog->add_filter(filter_any);
+
+    // Link Signal and show the dialog
+    dialog->signal_response().connect(sigc::mem_fun(*this, &CfgConvert::dialog_response));
+    dialog->show();
+}
+
+void CfgConvert::btnopen_clicked()
+{
+    // Create dialog
+    dialog = Gtk::FileChooserNative::create("Open Config File", *this,
+                                            Gtk::FILE_CHOOSER_ACTION_OPEN, "OK", "Cancel");
+    // Create filters
+    auto filter_any = Gtk::FileFilter::create();
+    filter_any->add_pattern("*");
+    filter_any->set_name("Any Config File");
+
+    dialog->add_filter(filter_any);
+
+    // Link Signal and show the dialog
+    dialog->signal_response().connect(sigc::mem_fun(*this, &CfgConvert::dialog_response));
+    dialog->show();
+}
+
+void CfgConvert::dialog_response(int response)
+{
+    if (response == Gtk::RESPONSE_ACCEPT)
+    {
+        // Use action to execute the save and open action
+        auto action = dialog->get_action();
+
+        // Get Filename
+        auto file = dialog->get_file();
+        auto path = file->get_path();
+        std::fstream outfile;
+        json data;
+        switch (action)
+        {
+        case Gtk::FILE_CHOOSER_ACTION_OPEN:
+            // Read data to std::map and show
+            if (readCfgFile(path, config_data))
+            {
+                treeview_init();
+            }
+            break;
+        case Gtk::FILE_CHOOSER_ACTION_SAVE:
+            // Save data to json file
+            data = json(config_data);
+            outfile.open(path, std::ios_base::out);
+            if (outfile.is_open())
+            {
+                outfile << data;
+            }
+            outfile.close();
+            break;
+        default:
+            std::cout << "Error!" << std::endl;
+        }
+        file.reset();
+    }
+    dialog.reset();
+}
+
+void CfgConvert::treeview_init()
+{
+    // Clear the data
+    m_liststore->clear();
+
+    // Append data
+    auto mite = config_data.begin();
+    for (; mite != config_data.end(); mite++)
+    {
+        auto row = *(m_liststore->append());
+        row[n_columns.key] = mite->first;
+        row[n_columns.value] = mite->second;
+    }
+}
diff --git a/Gtkmm3/gtk138_cfgconverter/src/CfgConvert.hh b/Gtkmm3/gtk138_cfgconverter/src/CfgConvert.hh
new file mode 100644
index 0000000..b4735a8
--- /dev/null
+++ b/Gtkmm3/gtk138_cfgconverter/src/CfgConvert.hh
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <gtkmm.h>
+#include "../cfgfile2/cfgfile.hh"
+
+class CfgConvert : public Gtk::ApplicationWindow
+{
+public:
+    CfgConvert();
+
+private:
+    // Config data
+    conf_map config_data;
+
+    // Open or save dialog
+    Glib::RefPtr<Gtk::FileChooserNative> dialog;
+    void dialog_response(int response_id);
+
+    // Child widgets
+    Gtk::Box main_box, btn_box;
+    Gtk::Button btnopen, btnsave;
+
+    // Treeview
+    class ModelColumns : public Gtk::TreeModelColumnRecord
+    {
+    public:
+        ModelColumns()
+        {
+            add(key);
+            add(value);
+        }
+        Gtk::TreeModelColumn<Glib::ustring> key;
+        Gtk::TreeModelColumn<Glib::ustring> value;
+    };
+
+    ModelColumns n_columns;
+    Gtk::TreeView cfg_view;
+    Glib::RefPtr<Gtk::ListStore> m_liststore;
+    void treeview_init();
+
+    // Signal Handlers
+    void btnopen_clicked();
+    void btnsave_clicked();
+};
\ No newline at end of file
diff --git a/Gtkmm3/gtk138_cfgconverter/src/main.cc b/Gtkmm3/gtk138_cfgconverter/src/main.cc
new file mode 100644
index 0000000..54a4586
--- /dev/null
+++ b/Gtkmm3/gtk138_cfgconverter/src/main.cc
@@ -0,0 +1,8 @@
+#include "CfgConvert.hh"
+
+int main(int argc, char **argv){
+    // Create a application
+    auto app = Gtk::Application::create(argc, argv, "org.gtk.daleclack");
+    CfgConvert cfgwin;
+    return app->run(cfgwin);
+}