diff --git a/src/gui/main_window.cpp b/src/gui/main_window.cpp
index e127646..7dddab6 100644
--- a/src/gui/main_window.cpp
+++ b/src/gui/main_window.cpp
@@ -3,55 +3,31 @@
 #include "memcard/memorycard.hpp"
 #include "make_nana_animation.hpp"
 #include "memcard/make_memory_card.hpp"
+#include "widget/block_grid.hpp"
+#include <nana/gui/filebox.hpp>
 #include <iostream>
-#include <fstream>
+#include <cassert>
 
 namespace duck {
 MainWindow::MainWindow (int icon_size, int icon_fps, const std::string& caption) :
-	m_grid1(*this, 3, true),
-	m_grid2(*this, 3, true),
-	m_label1(*this, "Slot 1"),
-	m_label2(*this, "Slot 2"),
+	nana::form(nana::API::make_center(800, 600)),
 	m_menubar(*this),
 	m_icon_size(icon_size),
 	m_icon_fps(icon_fps)
 {
-	using mc::psx::MemoryCard;
-
-#if !defined(NDEBUG)
-	m_grid1.bgcolor(nana::colors::azure);
-#endif
 	this->caption(caption);
 	this->init_menu();
 
-	const MemoryCard mc1(mc::psx::make_memory_card("/home/michele/dev/code/cpp/memoserv/epsxe000_xa2.mcr"));
-	const MemoryCard mc2(mc::psx::make_memory_card("/home/michele/dev/code/cpp/memoserv/michele_epsxe000.mcr"));
-
-
-	//auto mc1_info = mc1.content_info();
-	//std::cout << "memory card 1:\n";
-	//std::cout << "\tuse byte: 0x" << std::hex << mc1_info.use_byte << std::dec << '\n';
-	//std::cout << "\tavailable blocks: 0x" << std::hex << static_cast<int>(mc1_info.available_blocks) << std::dec << '\n';
-
-	for (int z = 0; z < 15; ++z) {
-		if (mc1[z].has_magic())
-			m_grid1.emplace_back(duck::make_nana_animation(mc1[z], m_icon_size, m_icon_size, m_icon_fps));
-		if (mc2[z].has_magic())
-			m_grid2.emplace_back(duck::make_nana_animation(mc2[z], m_icon_size, m_icon_size, m_icon_fps));
-	}
-
-	this->div("vert <menu weight=28><fit margin=3 <vert fit slot1> <width=25> <vert fit slot2>>");
+	this->div("vert <menu weight=28><fit margin=3 <fit slots gap=25>>");
 	(*this)["menu"] << m_menubar;
-	(*this)["slot1"] << m_label1 << m_grid1;
-	(*this)["slot2"] << m_label2 << m_grid2;
 	this->collocate();
-
-	//const MemoryCard mc(std::ifstream("/home/michele/emu/psx/WipEout 3 - Special Edition (Europe) (En,Fr,De,Es,It).srm", std::ios::binary));
-	//MemoryCard mc(std::ifstream("/home/michele/emu/psx/Rapid Racer (Europe) (En,Fr,De,Es,It).srm", std::ios::binary));
 }
 
+MainWindow::~MainWindow() noexcept = default;
+
 void MainWindow::init_menu() {
 	m_menubar.push_back("&File");
+	m_menubar.at(0).append("&Open...", [this](nana::menu::item_proxy&){this->open_file_from_dialog();});
 	m_menubar.at(0).append("E&xit", [](nana::menu::item_proxy&){nana::API::exit();});
 
 	m_menubar.push_back("&Help");
@@ -61,4 +37,30 @@ void MainWindow::init_menu() {
 		win.modality();
 	});
 }
+
+void MainWindow::open_file_from_dialog() {
+	nana::filebox fb(*this, true);
+	fb.allow_multi_select(true);
+	fb.add_filter(("PSX MemoryCard"), ("*.mcr;*.sav;*.srm"));
+	fb.add_filter(("All files"), ("*.*"));
+	auto files = fb();
+
+	for (const auto& file : files) {
+		m_memcards.push_back(mc::psx::make_memory_card(file));
+		m_grids.emplace_back(*this, 3, true);
+		m_grid_labels.emplace_back(*this, std::string("Slot ") + std::to_string(m_grid_labels.size() + 1));
+#if !defined(NDEBUG)
+		m_grids.back().bgcolor(nana::colors::azure);
+#endif
+
+		auto& mc = m_memcards.back();
+		auto& grid = m_grids.back();
+		for (int z = 0; z < 15; ++z) {
+			if (mc[z].has_magic())
+				grid.emplace_back(duck::make_nana_animation(mc[z], m_icon_size, m_icon_size, m_icon_fps));
+		}
+		(*this)["slots"] << m_grids.back();
+	}
+	this->collocate();
+}
 } //namespace duck
diff --git a/src/gui/main_window.hpp b/src/gui/main_window.hpp
index 3c6ac23..b6c2385 100644
--- a/src/gui/main_window.hpp
+++ b/src/gui/main_window.hpp
@@ -1,26 +1,34 @@
 #pragma once
 
-#include "widget/block_grid.hpp"
 #include <nana/gui.hpp>
 #include <nana/gui/widgets/label.hpp>
 #include <nana/gui/widgets/menubar.hpp>
 #include <string>
+#include <list>
+
+namespace mc::psx {
+	class MemoryCard;
+} //namespace mc::psx
 
 namespace duck {
+namespace widget {
+class BlockGrid;
+} //namespace widget
 
 class MainWindow : public nana::form {
 public:
 	MainWindow (int icon_size, int icon_fps, const std::string& caption);
+	~MainWindow() noexcept;
+
+	void open_file_from_dialog();
 
 private:
 	void init_menu();
 
-	duck::widget::BlockGrid m_grid1;
-	duck::widget::BlockGrid m_grid2;
-	nana::label m_label1;
-	nana::label m_label2;
 	nana::menubar m_menubar;
-
+	std::list<mc::psx::MemoryCard> m_memcards;
+	std::list<duck::widget::BlockGrid> m_grids;
+	std::list<nana::label> m_grid_labels;
 	int m_icon_size;
 	int m_icon_fps;
 };