Crash on XP Pro 64 bit

[Kimilly]

I just upgraded my machine and thought I would try out x64. The installer (1.0.200.4) works fine and the app launches but I get the following dialog:

Title: WoW Initialisation Error
Text: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)

This error can be acknowledged and the app appears to work fine until I try to load a project (creating a new project seems to work too). Then I get a similar error (crash) with the following trace details:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)
at Scintilla.ScintillaControl..ctor()
at wowuides.EditControl..ctor()
at wowuides.WowFileViewer.InitialiseControl()
at wowuides.WowFileViewer..ctor(FileInfo file, Int32 line, Int32 column)
at wowuides.MainForm.OpenFile(FileInfo fi, Int32 line, Int32 column, Type designer)
at wowuides.MainForm.FileOpen_Click(Object sender, EventArgs e)
at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ToolStrip.WndProc(Message& m)
at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)