I'm presently in Vista with IE 7 seeing NotePad as the automatic default text editor assgned with no other for HTML type files while online. With XP you can easily leave that blank without any particular program set for default.
The exact same thing is seen when trying it with Safari 3.1 as well. The link there was setup mainly for XP and also supports FireFox before Vista was out or using XP when originally posting the link and not running into this.
Here's what is seen when trying it with FF2 here.
The one thing not mentioned here yet was the fact that you need Microsoft office word document not even Word Pad to view it. Not everyone has that installed on their systems.