It took a team, Scott and the Canadian lady to get us going, me to come up with the solution that works great in development, Taifun to point out it did NOT work when you install an apk clean and me to be thorough and do some more looking!
This works in development
because App Inventor puts the file in an assets folder when it loads
and this works from the apk
because like all good android apps, it's assets are in the apk and the android browser can get at them using that url.
with great power comes great responsibility
It is a nice technique for putting good docs up.
It may open up a security hole???
and the page is not on a web server. Lot's of stuff will work, some may not. (something to test after V2.0?)
spread the word
and let us know here how it works for you.