In fact, it is not very difficult, in principle, to do:
In Explorer, right-click mouse button on the xml file and select the menu option «Open with». Then specify that you want to open the program Word. And he will!
But few would be kind of strange. A window will appear right where the offer to choose conversion table (xslTransform).
This is already a bit more tricky - most likely you will have to do it manually for each type of InfoPath. This is a simple xsl (xslt) file, which is used by the InfoPath to create representations.
You can, even when designing the form to indicate how to use xsl to transform. For example, the file template.xml add processing-instruction:
< ? xml-stylesheet type="text/xsl" href="http://hgroup.ru/Schemas/infopath/Person/Word.xsl" version="1.0" ? >
How is it done in my example at: http://hgroup.ru/Schemas/infopath/Person/default.html
PS: sorry, on Russian
PPS: Just clicked the wrong button (instead of reply :) ...