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Windows Registry Root Keys – most important keys in Windows Registry

Windows Registry Keys logo

Windows Registry Root Keys – most important keys in Windows Registry. 

As I noted earlier in registry are 5 root keys:


From the above mentioned, HKLM and HKU are the most important and the only root keys that windows forthwith on disk, while other root keys are links to subkey in HKLM.

Windows Registry Keys

HKCR a link oh the Classes subkey, located in HKLM \ SOFTWARE \ Classes .

HKCU is a link oh the subkey eg: HKEY_USERS \ S-1-5-19  .

HKCC is a link oh the subkey Current, located in the HKLM \ SYSTEM \ CurrentControlSet \ Hardware Profiles \ Current

registry root keys

Somewhere at the beginning of the previous  tutorials about regisitry  I explained to flash the root key, and now I a little more fully explain each of them.

HKEY_CLASSES_ROOT – This root key contains two components. The first is the synthesis of files that make up types of files with the same programs and files to open / edit / print. A second component of the registration COM files. And even to mention that the root key opens most opportunities for customization  and is the largest root key in the registry database. HKCR is created by merging the HKLM \ SOFTWARE \ Classes and HKCU \ SOFTWARE \ Classes, and if same values show in first and in the second PATH, path HKCU \ SOFTWARE \ Classes and have greater advantage. The synthesis of these two path has numerous advantages:

HKEY registry classes root

- Programs can be registered per-computer and per-user associations and files programming class, which means that one user can possess association files that, other users who share computer do not have.

- Users who shares one computer can use two different programs editing the same file type, without mutual influence.

- Percent of the per-user associations and class registration user profiles, they follow users from computer to computer when using roaming user profiles.

- Access to HKLM \ SOFTWARE \ Classes can be no limit on picking your HKCU \ SOFTWARE \ Classes.