regedit.exe and reg32.exe
Windows NT/2000 Regedit.exe and Regedt32.exe have two different functions. Windows XP has only one single registry editor.
Regedit.exe Windows XP has only a Single registry editor (Regedit.exe) Windows 2000 ahs two registry editor Regedit32.exe Regedit.exe
The Windows 95/98 registry is contained in two files, System.dat and User.dat.
In Windows 95, 98, and Me, the Registry is contained in two hidden files in your Windows directory, called USER.DAT and SYSTEM.DAT.
System.dat, User.dat
There are several files in Windows 98, far more than just two.
command prompt and control panel
System.dat, User.dat, System.da0, User.da0
Generally speaking, no. Most applications write their settings to the Windows registry. When the installation of Windows they were installed in isn't running, the applications cannot read their important settings, and so most will not function. "Portable" apps that store their setting in a local configuration file should run fine.
Two utilities are must for Windows. Antivirus and registry cleaner. I think you know about antivirus but i want to tell you about registry cleaner that will help to clean your windows registry and make it free from errors and inappropriate entries.
The windows XP registry consists of several files, loaded together they constitute the "registry"/ These files are Software, System, SAM, Security, Default, and UserDiff. They are located in Windows\System32\Config and are usually hidden or considered protected system files. One other registry file is called NTuser.dat and is located in the users Documents and Settings folder.
Windows 2000 applications and settings are kept and Windows XP upgrade is quicker than a fresh new installation of XP.