What do you make of this? There has been a NTusers.dat in all users since 2000 on my machines.
The Default User and All User Folders
The default contents placed inside all these folders in Richard's profile come directly from the same folders in the Default User profile. However, when Richard logs on, he may see icons or folders inside My Documents, Start Menu, and Desktop that do not appear in his own profile directories. These extra items are displayed as if they were part of Richard's profile, but in fact they are part of the All Users profile that also resides on the computer. In fact, the settings from the
All Users\NTUSER.DAT
file also are available to Richard. The All Users profile is a great way of adding new items to every user's profile on the client without having to add every item manually. During installation, NT-aware software tends to ask whether the installation is just for the user installing the software or whether it is for all users of the client. If the software is told that it is for all users, then it modifies the All Users profile by default.