Inside the Main Registry Keys
In the section, “Structure of the Registry,” you were introduced to the five top-level Registry keys. This section drills down into those keys a bit deeper, discussing exactly what types of things you can find under each.
HKEY_CLASSES_ROOT
HKEY_CLASSES_ROOT is made up of the contents of HKEY_LOCAL_MACHINE\Software\Classes combined with the contents of HKEY_CURRENT_USER\Software\Classes. Entries specified in the latter override conflicting entries specified in the former. This type of conflict can occur when the user specifies preferences that differ from the system's default settings. The first thing you will probably notice if you expand this key under the Registry Editor is a list of file extensions. These subkeys ...
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