We could really use that WMP10 thing from MSFN, to maybe wrap WMP11, and yea, this would totally work on Neptune, same as it dos on Windows 2000. As for the one from the first post, if Damian says it's not working, it's not, I guess that those two are different.
I changed the link in the first post to show the blog entry. It's better to link to the actual page, because people tend to move their files, and update the pages.