Windows Media Player

Strange issue on a fully patched XP Pro system running Windows Media Player 11 (WMP11) when trying to view an .asx web presentation that has worked before:

Windows Media Player cannot play the file because the specified protocol is not supported. In the Open URL dialog, try opening the file using a different transport protocol (for example, 'http:' or 'rtsp:')

The solution, a simple folder rename, yours could be 9, 10 or 11:
USERPROFILE%\local settings\Application Data\Microsoft\Windows Media\11.0