The public symbol file NTKRPAMP.PDB for the original release of Windows 10 tells that the kernel is built with the OB_X.H header at


and draws from it the following type definition:

Line Number Type WDM.H NTOSP.H
46 struct _OBJECT_HANDLE_INFORMATION 34775 44358

The header OB_X.H is not known in any Device Driver Kit (DDK) or Windows Driver Kit (WDK).