The 2 C:windowssystem.dat and C:windowsuser.dat are registry files. In addition, the system starts every day for the first time will do a backup, stored in the C:windowssysbckup under the name of Rb***.cab, Can be restored with Scanreg/restore in DOS.
After the first installation, there is also a system.1st file in the C-packing directory for the first time to start a backup.
Where the user profile is saved in the directory of the user name under the root directory "documents and Settings", including two hidden files: NTUSER.DAT, NTUSER. INI and Ntuser.dat.LOG log files. The system configuration file is located in "System32config" in the Windows 2000 system directory, including DEFAULT, SOFTWARE, System, APPEVENT.EVT, Secevent.evt, sysevent.evt and other hidden files and their corresponding. Log (log) files and. SAV files. These registry files cannot be opened with other tools while Windows 2000 is running, unlike System.dat and User.dat under Windows 9x.
The backup files are located under Windowsrepair.