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.

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Steph