: Click OK . Your Ribbon should now feature a tab or layout that mimics the Office 2003 toolbar style. Safety Note
: Open an Office application (e.g., Word ), right-click any part of the top Ribbon, and select "Customize the Ribbon" . Import the UI : buttons_for_2003.7z
Are you trying to apply these buttons to a of Office, like Office 365 or Office 2021 ? : Click OK
Navigate to your extracted folder and select the relevant .exportedUI file. buttons_for_2003.7z
In the bottom right of the options window, look for the button. Select Import customization file .