Kappris integration with versions of Microsoft Office prior to 2010 is achieved with an Outlook COM add-in for Outlook, and with two startup templates for Word.
You need to execute the following two commands after installation:
regsvr32 "<KAPPRIS PROGRAM FOLDER>\KapprisOffice.dll" /u regsvr32 "<KAPPRIS PROGRAM FOLDER>\OutlookPrint.dll"
The first command unregisters Outlook (and Word) integration for Office 2010. The second command registers Outlook integration for Office 2003/2007.
Find the startup folder Word is using (File Locations in the options dialog) and place @kpnt01.dot and KapprisWord.dot in this folder. Unless you have other COM add-ins or startup templates intercepting Word's print commands, this will be enough to make Kappris work in Word.