JSI Tip 5431. Windows 2000 setup added a '.Winnt' extension to the 'All Users' and 'Default User' profiles?

When you run Windows 2000 setup, if another Windows 2000 installation exists on the partition you just installed Windows 2000 to, even if you used a different folder, setup creates the All Users.Winnt and Default User.Winnt profiles.

To see what All Users and Default User profiles are being used by the Windows 2000 instance you just booted, inspect the data values of the AllUsersProfile and DefaultUserProfile Value Names at:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\ProfileList.

NOTE: See How do I recover a lost local user profile?

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