How the Registry is Organized

Written by Barry Dysert (last updated June 5, 2017)

The registry is at the heart of the Windows operating system. Ideally, you should never have to concern yourself with it, since things pretty well run in conjunction with the registry in a manner invisible to you. But sometimes it may be helpful to understand how the registry is organized just in case you need to look at it or even modify it.

There are five major sections to the registry. These sections are called "hives", and each hive is stored in its own hidden, system file on your hard disk. The five hives are:

HKEY_CLASSES_ROOT. This hive contains information about registered applications. It displays the same settings as exist in HKEY_LOCAL_MACHINE\Software\Classes.

HKEY_CURRENT_USER. This hive contains information about the user who is currently active on the PC. It's a subset of the information found in HKEY_USERS.

HKEY_LOCAL_MACHINE. This hive contains settings specific to your PC's hardware and software.

HKEY_USERS. This hive contains keys for all users of the PC.

HKEY_CURRENT_CONFIG. This hive is the only one that is not permanently stored on disk. It is populated with information gathered when Windows is booted.

Each hive contains keys and subkeys (and sub-subkeys, etc.) to actually get to the information required to make things work. For example, if you wanted to know what all programs could be used to open a file with the type of ".xps" you would navigate to the hive HKEY_CURRENT_USER and follow the path: "Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.xps\OpenWithList". When you finally get there, you'll find the names of keys, and each key will have a value. (See Figure 1.) These key/value pairs are what keep Windows (and your applications) running as expected.

Figure 1. A "leaf" registry node showing keys.

 This tip (7345) applies to Windows 7, 8, and 10.

Author Bio

Barry Dysert

Barry has been a computer professional for over 35 years, working in different positions such as technical team leader, project manager, and software developer. He is currently a software engineer with an emphasis on developing custom applications under Microsoft Windows. When not working with Windows or writing Tips, Barry is an amateur writer. His first non-fiction book is titled "A Chronological Commentary of Revelation." ...

MORE FROM BARRY

Ways to Combine Two (or More) Text Files

There have probably been times when you've wanted to combine two or more text files into one. Windows provides a few ...

Discover More

Burning an Audio Disc

You can use your system to create audio CDs that you can listen to in other places, such as your car. You just have to ...

Discover More

Moving Files Using the Command Line

The MOVE command can be a timesaver over trying to do the similar sort of thing with File Explorer. You can move hundreds ...

Discover More
More WindowsTips

Understanding Registry Value Data Types

Every key value in the registry has a data type. This tip explains the available data types supported in the registry.

Discover More

Finding Information in the Registry

The Registry is the central depository of configuration information used by Windows and by programs running on your ...

Discover More

Editing Registry Values

The Registry is the central depository of configuration information used by Windows and by programs running on your ...

Discover More
Comments

If you would like to add an image to your comment (not an avatar, but an image to help in making the point of your comment), include the characters [{fig}] (all 7 characters, in the sequence shown) in your comment text. You’ll be prompted to upload your image when you submit the comment. Maximum image size is 6Mpixels. Images larger than 600px wide or 1000px tall will be reduced. Up to three images may be included in a comment. All images are subject to review. Commenting privileges may be curtailed if inappropriate images are posted.

What is five minus 3?

There are currently no comments for this tip. (Be the first to leave your comment—just use the simple form above!)


Newest Tips