Hi There,
I hope this will be helpful to you, Open your form using InfoPath and do the following accordingly;
1. Select controls -> under Advanced double click on Hyperlink.
2. Under insert Hyperlink dialog box "link to" Address -> Provide the path of the word document (a valid path)
3. Under insert Hyperlink dialog box "Display" Text -> Type the text you wanted to hyperlink.
Thants it.. it's soo easy!! Enjoy using InfoPath!!!
Regards,
Intiqab