Stores the device path of the system partition in SysPartitionDevicePath and the device path of the system drive in SysDriveDevicePath. IMPORTANT: As this may take a very long time if called for the first time, it should be called only before performing a dangerous operation (such as header backup restore or formatting a supposedly non-system device) never at WM_INITDIALOG or any
source not stored for this graph (policy: none)
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