diff --git a/.gitignore b/.gitignore
index 9970017..be36e49 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@ out/
 build/
 CMakeLists.txt.user
 **/.DS_Store
+xcuserdata/
 .swiftpm/
diff --git a/NesKit/NesSystem.h b/NesKit/NesSystem.h
index 3a025d9..8f9f5e5 100644
--- a/NesKit/NesSystem.h
+++ b/NesKit/NesSystem.h
@@ -15,7 +15,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property CGImageRef frame;
 
 - (instancetype)init;
-- (void)runRom:(NSString*)path;
+- (void)runRom:(NSURL*)url;
 - (void)stepToNextFrame;
 
 @end
diff --git a/NesKit/NesSystem.mm b/NesKit/NesSystem.mm
index 98a3988..2b15c9a 100644
--- a/NesKit/NesSystem.mm
+++ b/NesKit/NesSystem.mm
@@ -30,7 +30,11 @@
 }
 
 - (void)runRom:(NSURL*)url {
+    
+    [url startAccessingSecurityScopedResource];
     _system->insertCartridge([url fileSystemRepresentation]);
+    [url stopAccessingSecurityScopedResource];
+    
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
         while(TRUE) {
             [_condition lock];
diff --git a/NesKitSwift/NesSystemSwift.swift b/NesKitSwift/NesSystemSwift.swift
index 5bda4a7..4fa4cd1 100644
--- a/NesKitSwift/NesSystemSwift.swift
+++ b/NesKitSwift/NesSystemSwift.swift
@@ -10,14 +10,10 @@ import NesKitCpp
 
 class NesSystemSwift {
     
-    var nesSystem: nes.System?
-    
-    init() {
-        
-        let frameBufferSize = nes.Ppu.SCREEN_WIDTH * nes.Ppu.SCREEN_HEIGHT * MemoryLayout<nes.Pixel>.stride
-        
-        nesSystem?.setNewFrameCallback({ frameBuffer in
-            
-        })
-    }
+//    var nesSystem: nes.System?
+//    
+//    init() {
+//        
+//        let frameBufferSize = nes.Ppu.SCREEN_WIDTH * nes.Ppu.SCREEN_HEIGHT * MemoryLayout<nes.Pixel>.stride
+//    }
 }
diff --git a/examples/NesApp/NesApp.xcodeproj/project.xcworkspace/xcuserdata/selim.xcuserdatad/UserInterfaceState.xcuserstate b/examples/NesApp/NesApp.xcodeproj/project.xcworkspace/xcuserdata/selim.xcuserdatad/UserInterfaceState.xcuserstate
deleted file mode 100644
index 59f273e..0000000
Binary files a/examples/NesApp/NesApp.xcodeproj/project.xcworkspace/xcuserdata/selim.xcuserdatad/UserInterfaceState.xcuserstate and /dev/null differ
diff --git a/examples/NesApp/NesApp/ContentView.swift b/examples/NesApp/NesApp/ContentView.swift
index 4f01f6b..848b1cd 100644
--- a/examples/NesApp/NesApp/ContentView.swift
+++ b/examples/NesApp/NesApp/ContentView.swift
@@ -6,16 +6,36 @@
 //
 
 import SwiftUI
+import NesKit
+import UniformTypeIdentifiers
 
 struct ContentView: View {
+    
+    @State var system = NesSystem()
+    @State var showFileImporter = false
+    
     var body: some View {
-        VStack {
-            Image(systemName: "globe")
-                .imageScale(.large)
-                .foregroundStyle(.tint)
-            Text("Hello, world!")
-        }
-        .padding()
+        NesView(system: system)
+            .fileImporter(
+                isPresented: $showFileImporter,
+                allowedContentTypes: [.init(filenameExtension: "nes") ?? .data],
+                allowsMultipleSelection: false) { result in
+                    switch result {
+                    case .success(let urls):
+                        if let url = urls.first {
+                            system.runRom(url)
+                        }
+                    case .failure(let error):
+                        print("error: \(error)")
+                    }
+                }
+                .toolbar {
+                    Button {
+                        showFileImporter = true
+                    } label: {
+                        Image(systemName: "document.badge.plus")
+                    }
+                }
     }
 }
 
diff --git a/examples/NesApp/NesApp/NesView/NesSystemView.swift b/examples/NesApp/NesApp/NesView/NesSystemView.swift
new file mode 100644
index 0000000..8a4c0b3
--- /dev/null
+++ b/examples/NesApp/NesApp/NesView/NesSystemView.swift
@@ -0,0 +1,23 @@
+//
+//  NesSystemView.swift
+//  NesApp
+//
+//  Created by Selim Mustafaev on 04.10.2025.
+//
+
+import AppKit
+import NesKit
+
+class NesSystemView: NSView {
+    
+    init(system: NesSystem) {
+        super.init(frame: .zero)
+        
+        self.layer = NesLayer(nesSystem: system)
+        self.wantsLayer = true
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+}
diff --git a/examples/NesApp/NesApp/NesView/NesView.swift b/examples/NesApp/NesApp/NesView/NesView.swift
index 0ba1a74..7d31e34 100644
--- a/examples/NesApp/NesApp/NesView/NesView.swift
+++ b/examples/NesApp/NesApp/NesView/NesView.swift
@@ -5,27 +5,20 @@
 //  Created by Selim Mustafaev on 04.10.2025.
 //
 
-import UIKit
+import AppKit
+import SwiftUI
 import NesKit
 
-class NesView: UIView {
+struct NesView: NSViewRepresentable {
     
-    let nesLayer: NesLayer
+    @State var system: NesSystem
     
-    init(system: NesSystem) {
-        self.nesLayer = NesLayer(nesSystem: system)
-        super.init(frame: .zero)
+    func makeNSView(context: Context) -> NesSystemView {
         
-        self.layer.addSublayer(self.nesLayer)
+        NesSystemView(system: system)
     }
     
-    required init?(coder: NSCoder) {
-        fatalError("init(coder:) has not been implemented")
-    }
-    
-    override func layoutSubviews() {
-        super.layoutSubviews()
+    func updateNSView(_ nsView: NesSystemView, context: Context) {
         
-        self.nesLayer.frame = self.layer.frame
     }
 }