Open Windows Explorer and go to Tools Folder Options. Click on the
"File Types" tab and change the file association for .zip files.

--JP

On Oct 16, 3:24*pm, Steph wrote:
I am trying to create an add-in using Excel 2007. *When I renamed the xlsm
extension to xlsm.zip, I accidently tried to open the xlsm.zip file with
Notepad instead of double-clicking on the xlsm.zip folder. *Now every Excel
xlsm file that I create and then add a .zip extension to appears as a Notepad
file instead of a Windows folder. *As a result, I can't open an xlsm.zip
files. *Would appreciate your help. *

--
Steph