Maybe you should take a step back and think about why you're using word documents as the basis of your help section. It seems a bit backwards to me.
Just move it all once into something online and leave it there and updated it there, why does it need to be live it's life as a Word document?
You say you don't want .chm files in your post, so I'm guessing what you're chasing is something more like the MSDN style of presentation. This is a pretty common style of presentation for API docs generated with JavaDOC/PHPDOC/nDoc and many other generators, but you're still not going to be able to use word documents.