Why will Openicon not work in VB.NET 2010 express?

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VB

Hi,
I have used this code before, however it does not work in VS2010 Express.
It compiles, but then on call, it gives a stack error:
{A call to PInvoke function 'WindowsApplication1!WindowsApplication1.Form1::OpenIcon' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.}

It crashes on openicon and setforegroundwindow.

The path I used is correct.

Private Declare Function OpenIcon Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hWnd As Long) As Long
Dim hWnd As Long
hWnd = FindWindow(vbNullString, "C:\newfolder\RFDRIVERSIMULATION.EXE")
OpenIcon (hWnd)
SetForegroundWindow (hWnd)
' SendKeys etc