Reporting broken important URL at website shell.windows.com

one of important pages at URL
http://shell.windows.com/fileassoc/f...oc.asp?Ext=mp3 (example of URL)
reports 404 error ??? page not found. Previous page was redirecting visitor to
http://search.live.com/results.aspx?...+extension+mp3, where the ???mp3???
extension was used in both URLs.

You can get to this URL from any Windows XP and Vista, if you trying to open
any file in explorer with "Open with..." context menu, will appears dialog
window. At bottom of this window is blue link with text "find appropriate
application for this extension at web"... after clicking 404 page appears. 3
days back it was working correctly.

Can you please forward this report to website administrator of
shell.windows.com?

Thank you in advance.

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Edit:
Published URL is an example URL. It is doing for ALL
EXTENSIONS without any exception. It has nothing to do with this sample mp3
extension.