OK – the title is misleading on purpose – in short you can’t do it via programming. You can for MS Project though. For excel all I have to say is …. Man people have too much spare time. Now … so do I !!! Incredible – how to add a ribbon item IN a xlsm file. It disappears once the workbook is closed though.

Once the utility is installed it is in your start menu called ‘Custom UI Editor For Microsoft Office’

http://stackoverflow.com/questions/8850836/how-to-add-a-custom-ribbon-tab-using-vba