Opening/Activating Word Documents in a VBA macro

I'm hoping a VB/VBA expert can help me out. Consider the following: The user opens a document in Word 2003, and within the Normal.dot AutoOpen macro, we look at current document, and if it has been opened by clicking on a link on a webpage, and meets certain other application specific criteria, close the streamed 'copy' and open the source document (found on a shared drive we can assume the user has access to):

Documents.Open origDoc Documents(ActiveDocument.FullName).Close SaveChanges:=wdDoNotSaveChanges Documents(origDoc).Activate With ActiveDocument ''# Do work End With 

My thought was that I needed to call Activate to ensure that the original document was the ActiveDocument , but I'm getting a 4160 'Bad file name' error on the .Activate call. If I comment out the call to .Activate , it appears that ActiveDocument is set to the origDoc document, even if there were other documents already opened (I'm not really sure how the Documents Collection is managed, and how Word determines what next ActiveDocument would be if you programatically close the current ActiveDocument) So, does calling .Open on a document explicitly set the Document to be the ActiveDocument ? Also, does calling .Activate on the already active document cause an error? I haven't really been able to find much documentation about this, so thanks in advance for any suggestions and insight!