Subclass External Programs done for you

[moeur]

Under Windows 95, 98, and ME, if Notepad is not already open when the "Set Hook" button is pressed in the HookDemo2 executable, Notepad tends to produce a fault.

This makes no sense. The code for getting the handle to notepad is

'get handle to parent window
  hWndParent = FindWindow(vbNullString, ParentCaption)
  While hWndParent = 0
    If MsgBox("Open Notepad", vbOKCancel) = vbCancel Then Exit Sub
    hWndParent = FindWindow(vbNullString, ParentCaption)
  Wend

As you can see, if notepad isn't open then Findwindow returns zero
Then a message box appears,
if the user presses OK, then findwindow is called again.
There is no difference between the first call to findwindow and the second.