I am looking for the VBA to identify if a workbook is already open and, if
not, to open it, otherwise to open the workbook window.

I have:-
i) Worksbooks.Open("Filename.xls")

and
ii) Windows("Filename.xls).Activate

but I require somethiing to stop the 'overwrite' message popping up after
running i), if already open, and then running ii)

Hope this makes sense

Any help appreciated.