Systemowe okno do wyboru pliku czy pisać własne w SFML?

timer += deltaTime.asSeconds();

if( timer > 10.0f ) {
    timer = 0;
    wchar_t fileName[ MAX_PATH ] = L"";
   
    OPENFILENAMEW ofn = { };
    ofn.lStructSize = sizeof( ofn );
    ofn.hwndOwner = Main::render_window->getNativeHandle();
    ofn.lpstrFile = fileName;
    ofn.nMaxFile = MAX_PATH;
   
    ofn.lpstrFilter =
    L"PNG Files (*.png)\0*.png\0"
    L"All Files (*.*)\0*.*\0";
   
    ofn.nFilterIndex = 1;
    ofn.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST;
   
    if( GetOpenFileNameW( & ofn ) ) {
        std::wcout << L"Selected file: " << fileName << std::endl;
    }
    else {
        std::wcout << L"Canceled." << std::endl;
    }
}