diff --git a/Gtk4/gtk147_file_exp2/.vscode/settings.json b/Gtk4/gtk147_file_exp2/.vscode/settings.json
new file mode 100644
index 0000000..b4d8c35
--- /dev/null
+++ b/Gtk4/gtk147_file_exp2/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"
+}
\ No newline at end of file
diff --git a/Gtk4/gtk147_file_exp2/CMakeLists.txt b/Gtk4/gtk147_file_exp2/CMakeLists.txt
new file mode 100644
index 0000000..d674787
--- /dev/null
+++ b/Gtk4/gtk147_file_exp2/CMakeLists.txt
@@ -0,0 +1,61 @@
+set(CMAKE_CXX_STANDARD 17)
+cmake_minimum_required(VERSION 3.0.0)
+project(gtk147 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 ${PROJECT_VERSION})
+
+include(CPack)
+include_directories(.)
+include_directories(..)
+
+find_package (PkgConfig REQUIRED)
+pkg_check_modules (GTK4 REQUIRED gtk4)
+include_directories (${GTK4_INCLUDE_DIRS})
+link_directories (${GTK4_LIBRARY_DIRS})
+
+#Compile Resource
+#[[
+set(RESOURCE_LIST
+    Yanni-Nightingale.mp3)
+
+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})]]
+
+#SOURCE FILES LIST
+set(SOURCES src/main.cpp src/FileManager.cpp)
+
+#For win32 platform,use rc resource and .ico icon
+if(WIN32)
+	SET(CMAKE_RC_COMPILER 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} ${SOURCES})
+else()
+	add_executable(${PROJECT_NAME} ${SOURCES})
+
+endif(WIN32)
+
+#Add command to generate .gitignore
+add_custom_command(TARGET ${PROJECT_NAME} 
+                   COMMAND echo \"*\" > ${CMAKE_BINARY_DIR}/.gitignore
+                   COMMAND echo \"**/*\" > ${CMAKE_BINARY_DIR}/.hgignore)
+
+SET (CMAKE_EXTRA_CXX_FLAGS ${GTK4_CFLAGS_OTHER})
+target_link_libraries (${PROJECT_NAME} ${GTK4_LIBRARIES} -lpthread)
diff --git a/Gtk4/gtk147_file_exp2/src/FileManager.cpp b/Gtk4/gtk147_file_exp2/src/FileManager.cpp
new file mode 100644
index 0000000..fad103a
--- /dev/null
+++ b/Gtk4/gtk147_file_exp2/src/FileManager.cpp
@@ -0,0 +1,19 @@
+#include "FileManager.h"
+
+struct _FileManager{
+    GtkWindow parent_instance;
+};
+
+G_DEFINE_TYPE(FileManager, file_manager, GTK_TYPE_WINDOW)
+
+static void file_manager_init(FileManager *self){
+
+}
+
+static void file_manager_class_init(FileManagerClass *klass){
+
+}
+
+FileManager *file_manager_new(){
+    return FILE_MANAGER(g_object_new(file_manager_get_type(), NULL));
+}
diff --git a/Gtk4/gtk147_file_exp2/src/FileManager.h b/Gtk4/gtk147_file_exp2/src/FileManager.h
new file mode 100644
index 0000000..ce801fd
--- /dev/null
+++ b/Gtk4/gtk147_file_exp2/src/FileManager.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE(FileManager, file_manager, FILE, MANAGER, GtkWindow)
+
+FileManager *file_manager_new();
diff --git a/Gtk4/gtk147_file_exp2/src/main.cpp b/Gtk4/gtk147_file_exp2/src/main.cpp
new file mode 100644
index 0000000..0332022
--- /dev/null
+++ b/Gtk4/gtk147_file_exp2/src/main.cpp
@@ -0,0 +1,20 @@
+#include "FileManager.h"
+
+static void gtkmain(GtkApplication *app, gpointer user_data){
+    // Create a main window
+    FileManager *file_win = file_manager_new();
+
+    // Add the window to the application
+    gtk_application_add_window(app, GTK_WINDOW(file_win));
+
+    // Show the window
+    gtk_window_present(GTK_WINDOW(file_win));
+}
+
+int main(int argc, char **argv)
+{
+    // Create a application and run
+    GtkApplication *app = gtk_application_new("org.gtk.daleclack", G_APPLICATION_NON_UNIQUE);
+    g_signal_connect(app, "activate", G_CALLBACK(gtkmain), NULL);
+    return g_application_run(G_APPLICATION(app), argc, argv);
+}
diff --git a/Gtkmm4/gtk146_gtkui6_a3/src/MainWin.cc b/Gtkmm4/gtk146_gtkui6_a3/src/MainWin.cc
index ca6c86a..c77c74d 100644
--- a/Gtkmm4/gtk146_gtkui6_a3/src/MainWin.cc
+++ b/Gtkmm4/gtk146_gtkui6_a3/src/MainWin.cc
@@ -59,8 +59,10 @@ MainWin::MainWin()
     label1.set_valign(Gtk::Align::FILL);
     main_box.append(label1);
 
-    // Add buttons]
+    // Background color for btn_box
     btn_box.add_css_class("accdoration");
+
+    // Add buttons
     btn_main.set_has_frame(false);
     btn_win1.set_has_frame(false);
     btn_win2.set_has_frame(false);