Excel VBA can't open Workbook

Question

First: I\'m using Excel 2007, but the code has to work for Excel 2003 as well.

My problem is the following: I need to access cells in a different workbook, which may

Answer 1

You can use this (similar to what Bruno Leite proposed, but much simpler to write):

Dim excelApp As New Excel.Application
excelApp.Visible = False
Set WB = excelApp.Workbooks.Open(FileName, xlUpdateLinksNever, True)

As UDFs are called repeatedly, you should make sure to do an excelApp.Quit before exiting the function (and a WB.close(False) before) to avoid having countless Excel instances running on your box.

I spent some thoughts on it and came to the conclusion that you cannot mess around with the workbooks of the current instance of excel while executing a UDF. On the other hand, opening a second instance of excel will do the job without interference.