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The HKLM\SYSTEM\CurrentControlSet\HardwareProfiles registry tree contains information about the hardware profiles on the system. Hardware profiles are deprecated and state should not be stored relative to a hardware profile.
Instead, store information globally using PLUGPLAY_REGKEY_DEVICE and PLUGPLAY_REGKEY_DRIVER without also using PLUGPLAY_REGKEY_CURRENT_HWPROFILE. For more info, see IoOpenDeviceRegistryKey.