Hello I'm trying to develop a python console in WPF : to do it I have to execute a C# string as a python expression. When I initialize the python engine (python 2.6), I get an exception (incorrect format). If I delete the python26.dll, it is asking for it, so it must be a version issue but I really have no clue to solve it. It turns out that the "Console" project inside pythonnet solution has the same issue. Does it work for you? Thanks Guillaume Ps: System.BadImageFormatException was unhandled Message="Tentative de chargement d'un programme de format incorrect. (Exception de HRESULT : 0x8007000B)" Source="Python.Runtime" StackTrace: à Python.Runtime.Runtime.Py_Initialize() à Python.Runtime.Runtime.Initialize() dans D:\pythonnet\trunk\pythonnet\src\runtime\runtime.cs:ligne 70 à Python.Runtime.PythonEngine.Initialize() dans D:\pythonnet\trunk\pythonnet\src\runtime\pythonengine.cs:ligne 118 à Python.Runtime.PythonEngine.InitExt() dans D:\pythonnet\trunk\pythonnet\src\runtime\pythonengine.cs:ligne 150 à ProtoCPython.Window1.Button_Click(Object sender, RoutedEventArgs e) dans C:\Users\guillaume.buisson\Documents\Visual Studio 2008\Projects\ProtoCPython\ProtoCPython\Window1.xaml.cs:ligne 29 à System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) à System.Windows.UIElement.RaiseEventImpl(RoutedEventArgs args) à System.Windows.Controls.Button.OnClick() à System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e) à System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) à System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) à System.Windows.UIElement.ReRaiseEventAs(RoutedEventArgs args, RoutedEvent newEvent) à System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e) à System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) à System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) à System.Windows.UIElement.RaiseEventImpl(RoutedEventArgs args) à System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted) à System.Windows.Input.InputManager.ProcessStagingArea() à System.Windows.Input.InputManager.ProcessInput(InputEventArgs input) à System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport) à System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel) à System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) à System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) à MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) à MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) à System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) à System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) à System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter) à MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) à MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) à System.Windows.Threading.Dispatcher.TranslateAndDispatchMessage(MSG& msg) à System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) à System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) à System.Windows.Application.RunInternal(Window window) à System.Windows.Application.Run(Window window) à ProtoCPython.App.Main() dans C:\Users\guillaume.buisson\Documents\Visual Studio 2008\Projects\ProtoCPython\ProtoCPython\obj\Debug\App.g.cs:ligne 0 à System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) à Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) à System.Threading.ThreadHelper.ThreadStart() InnerException: