The following lines were added (+) and removed (-):
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.avi\OpenWithList (1) HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.avi\OpenWithList HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.avi\OpenWithProgids (2) HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.avi\OpenWithProgids HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.avi\OpenWithList\wmplayer.exe (3) HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.avi\OpenWithList\wmplayer.exe HKEY_CLASSES_ROOT\.avi\OpenWithList\wmplayer.exe (4) HKEY_CLASSES_ROOT\.avi\OpenWithList\wmplayer.exe HKEY_CLASSES_ROOT\.avi\OpenWithProgIds (5) HKEY_CLASSES_ROOT\.avi\OpenWithProgIds HKEY_CLASSES_ROOT\SystemFileAssociations\video\OpenWithList\wmplayer.exe (6) HKEY_CLASSES_ROOT\SystemFileAssociations\video\OpenWithList\wmplayer.exeRemove mplayer.exe from either (1) or (2) if present. It may be in (2) only. Item (3) you do not have to remove, it will be removed by the system. Remove (4) and (6). Now Windows Media Player (mplayer.exe) will not appear in the right click Open With shell menu.