You don't have to unzip/rezip to edit the customUI.xml. If you install 7Zip you can simply right click on the dotm file and choose to Open the Archive and then double click the file to open it in your default text editor. When you close that you are prompted to decide to update the zip file or not. You can also choose to use a CustomUI Editor which also avoids having to fiddle around with the zip format.

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Andrew Lockton
Chrysalis Design, Melbourne Australia