In Word, they would be stored in a template file (usually normal.dot, but
some people have toolbars stored in additional template files). To find the
location of normal.dot, choose Tools - Options - File Locations. Normal.dot
is stored in the User Templates location.
Starting from Office 2002 (Office XP) onwards, there is a "Save My Settings
Wizard" available in Windows Start menu, under "Microsoft Office Tools" menu
within the Microsoft Office menu. Try using that.