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Show More. People also like. Permadelete Free. Smart Disk Cleanup Free. Privacy policy. This article describes the Windows registry and provides information about how to edit and back up it.
A central hierarchical database used in Windows 98, Windows CE, Windows NT, and Windows used to store information that is necessary to configure the system for one or more users, applications, and hardware devices.
The Registry contains information that Windows continually references during operation, such as profiles for each user, the applications installed on the computer and the types of documents that each can create, property sheet settings for folders and application icons, what hardware exists on the system, and the ports that are being used. The Registry replaces most of the text-based. Although the Registry is common to several Windows operating systems, there are some differences among them.
A registry hive is a group of keys, subkeys, and values in the registry that has a set of supporting files that contain backups of its data. The file name extensions of the files in these folders indicate the type of data that they contain.
Also, the lack of an extension may sometimes indicate the type of data that they contain. In Windows 98, the registry files are named User. In Windows Millennium Edition, the registry files are named Classes. The following table lists the predefined keys that are used by the system. The maximum size of a key name is characters. Many of the bit keys have the same names as their bit counterparts, and vice versa. For more information about how to view the registry on Bit versions of Windows, see How to view the system registry by using bit versions of Windows.
The following table lists the data types that are currently defined and that are used by Windows. The maximum size of a value name is as follows:. Long values more than 2, bytes must be stored as files with the file names stored in the registry. This helps the registry perform efficiently. The maximum size of a value is as follows:. Before you edit the registry, export the keys in the registry that you plan to edit, or back up the whole registry.
If a problem occurs, you can then follow the steps in the Restore the registry section to restore the registry to its previous state. To back up the whole registry, use the Backup utility to back up the system state. For more information about how to use the Backup utility to back up the system state, see the following articles:.
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Over 1,, fellow IT Pros are already on-board, don't be left out! When you do so, you can choose up to five registry backup files listed for you to restore. Right-click the file that you want to restore, click Extract, and then choose the folder where the new file is to be placed. Microsoft recommends that you place the file in your Temp folder. Copy the file that you extracted to the appropriate folder.
Note that registry. If your registry contains an entry that references a file such as a. Such errors are not typically damaging, and you can manually remove the entry. The amount of conventional memory that is required by Windows Registry Checker is determined by the size of your registry. Windows Registry Checker may require KB or more of free conventional memory to complete the repair process. If you encounter an "Out of Memory" error message, optimize your free conventional memory.
For additional information about Registry Checker command line switches, click the article number below to view the article in the Microsoft Knowledge Base:. Windows More
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