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  1. The HKEY_USERS Key The HKEY_USERS key contains all actively loaded user profiles. In this case, the key contains the following subkeys: the .DEFAULT subkey, subkeys for all user accounts currently logged on to the system, and _Classes subkeys that contain file associations and COM classes for specific SIDs (Fig. 7.23). Figure 7.23: The HKEY_USERS key structure Note More detailed information on the contents of the HKEY_USERS registry key will be provided in Chapter 10. The data from the .DEFAULT subkey is used if no one is currently logged on to the system. The .DEFAULT subkey contains the same subkeys as the HKEY_CURRENT_USER key. These keys were listed in Table 7.3.