Thanks to the good advice from Paul Lawrence, John Moran and Ruth Mickelson, I finally determined my correct XP path from UFT to Word. It is C:progra~1micros~2office10winword.exe. Part of my problem was my early and incorrect conclusion that my path went through micros~4 instead of micros~2.
It is really appreciated that our UFT message board has very experienced people such as Paul, John and Ruth that donate so much time helping us. Many thanks to the three of you.