OS Version: Microsoft Windows NT 10.0.19041.0 (64bit)
NeeView Version: 38.3 (.msi)

System.NullReferenceException: オブジェクト参照がオブジェクト インスタンスに設定されていません。
   場所 NeeView.Page.GetFolderOpenPlace()
   場所 NeeView.BookOperation.OpenFilePlace()
   場所 NeeView.OpenExplorerCommand.Execute(Object sender, CommandContext e)
   場所 NeeView.CommandElement.Execute(Object sender, CommandArgs args)
   場所 NeeView.RoutedCommandTable.Execute(Object sender, String name, Object parameter)
   場所 NeeView.RoutedCommandBinding.<>c__DisplayClass10_0.<CreateCommandBinding>b__0(Object sender, ExecutedRoutedEventArgs e)
   場所 System.Windows.Input.CommandBinding.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
   場所 System.Windows.Input.CommandManager.ExecuteCommandBinding(Object sender, ExecutedRoutedEventArgs e, CommandBinding commandBinding)
   場所 System.Windows.Input.CommandManager.FindCommandBinding(CommandBindingCollection commandBindings, Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   場所 System.Windows.Input.CommandManager.FindCommandBinding(Object sender, RoutedEventArgs e, ICommand command, Boolean execute)
   場所 System.Windows.Input.CommandManager.OnExecuted(Object sender, ExecutedRoutedEventArgs e)
   場所 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   場所 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   場所 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   場所 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   場所 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   場所 System.Windows.Input.RoutedCommand.ExecuteImpl(Object parameter, IInputElement target, Boolean userInitiated)
   場所 System.Windows.Input.CommandManager.TranslateInput(IInputElement targetElement, InputEventArgs inputEventArgs)
   場所 System.Windows.UIElement.OnKeyDownThunk(Object sender, KeyEventArgs e)
   場所 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   場所 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   場所 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   場所 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   場所 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   場所 System.Windows.Input.InputManager.ProcessStagingArea()
   場所 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   場所 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   場所 System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
   場所 System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
   場所 System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
   場所 System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
   場所 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   場所 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   場所 System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   場所 System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   場所 System.Windows.Interop.HwndSource.OnPreprocessMessageThunk(MSG& msg, Boolean& handled)
   場所 System.Windows.Interop.ComponentDispatcherThread.RaiseThreadMessage(MSG& msg)
   場所 System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   場所 System.Windows.Application.RunDispatcher(Object ignore)
   場所 System.Windows.Application.RunInternal(Window window)
   場所 NeeView.App.Main()