If you don't have a customUI folder then you don't have ribbon code inside that document.

You can use your Custom UI Editor to place ribbon code in docx document. If that ribbon code relies on macros then the document will need to be a docm.

It is inefficient to place the ribbon code in a docx or docm document. Generally it is better to place the ribbon & macro code in a dotx or dotm template and attach that to the document. You can then attach that same template to lots of other documents so that the code doesn't need to be updated/maintained in lots of places.

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Andrew Lockton
Chrysalis Design, Melbourne Australia