Starting with Windows XP, Regedit.exe is the only registry editor. When you run Regedt32.exe, Regedit.exe starts.
This version of Regedit.exe includes the Permissions and Favorites menu.
The Favorites feature allows you to get quick access to frequently used registry keys. When you select a key, you can use Add to Favorites on the Favorites menu and enter a name that you can recall, or use the default name. To delete an entry, select it in the Favorites menu and press Remove Favorite, and OK to confirm.
The Permissions menu allows you to assign permissions, audit registry access, and assign ownership of a key. To assign permissions, select the key and press Permissions on the Edit menu. Select the user or group that you want to work with and check/uncheck the Allow or Deny box next to the appropriate level. To grant special permission on the key, press Advanced and double-click the user or group. Check /uncheck the Allow or Deny box as appropriate. To add a user or group to the permissions list, press Add on the Permissions dialog. Select the domain or computer of the user or group, the name of the user or group, and press Add and OK. Assign the type of access.
NOTES The Advanced dialog allows you to check Inherit from parents the permission entries that apply to child objects. Include these with entries explicitly defined here or Replace permission entries on all child objects with entries shown here that apply to child object.
To change ownership of a key, select the key and press Permissions on the Edit menu. Select the Owner tab in the Advanced dialog. Select the new owner and press OK.
NOTE: Administrators can take ownership of a key, as can any user that has been granted the take ownership permission by the current owner.
NOTE In command line operation the following switches still function:
/S - regedit /s filename.reg to silently import.
/E - regedit /e filename.reg key to export in native mode.
/A - regedit /a filename.reg key to export in REGEDIT4 format.