[AccessD] (OT?)Workbook_Open in Excell doesn't fire?

Hi group,
 
I've got an access application that lists a lot of Excel sheets. They all have code in the Workbook_Open event. For one workbook/file this event doesn't fire.
 
Does anybody have any idea why this event doesn't fire? Could this be some vage option?
 
Private Sub Workbook_Open()
   MsgBox "hello"
    'Call Procedure_Update    
End Sub
 
TIA
 
Sander

		
---------------------------------
Do you Yahoo!?
Friends.  Fun. Try the all-new Yahoo! Messenger