Note
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Do not directly access the registry keys for device setup classes. As with any registry key, the ___location and name of these keys might change between different versions of Windows.
To safely open the registry keys of a device setup class, use one of the following functions:
CM_Open_Class_Key with the ulFlags parameter set to CM_OPEN_CLASS_KEY_INSTALLER
SetupDiOpenClassRegKeyEx with the Flags parameter set to DIOCR_INSTALLER