Interesting.
You don't even need to use notepad. For example, if I open that wav file in my copy (legal!) of Adobe Audition, and choose wave properties, it shows the "Software Package" field as Sound Forge, and the "Engineer" as Deepz0ne.
I'm sure MS didn't do that stuff in house. They out source this kind of thing to some studio who must have been using the cracked software.
It does present a bit of a black eye for MS, since most people don't understand that. Hopefully MS has found out about it and is not using that contractor again.