ExtensionĪ backup copy of the critical HKEY_LOCAL_MACHINE\System hive. The following table lists these extensions along with a description of the data in the file. The file name extensions of the files in these directories, or in some cases a lack of an extension, indicate the type of data they contain. These files are updated each time a user logs on. Most of the supporting files for the hives are in the %SystemRoot%\System32\Config directory. On versions of Windows that support the latest format, the following hives still use the standard format: HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE\SAM, HKEY_LOCAL_MACHINE\Security, and HKEY_USERS\.DEFAULT all other hives use the latest format. The latest format is supported starting with Windows XP. It is also supported by later versions of Windows for backward compatibility. The standard format is the only format supported by Windows 2000. Registry files have the following two formats: standard and latest. User profile hives are located under the HKEY_USERS key. A user's hive contains specific registry information pertaining to the user's application settings, desktop, environment, network connections, and printers. A hive is a logical group of keys, subkeys, and values in the registry that has a set of supporting files loaded into memory when the operating system is started or a user logs in.Įach time a new user logs on to a computer, a new hive is created for that user with a separate file for the user profile.
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