PS.H

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

d:\th\minkernel\ntos\inc

and draws from it the following type definitions:

Line Number	Type
53	enum _WORKING_SET_TYPE
78	struct _MMSUPPORT_FLAGS
137	struct _MMSUPPORT
190	struct _SE_AUDIT_PROCESS_CREATION_INFO
198	enum _PS_RESOURCE_TYPE
210	struct _EPROCESS_VALUES
227	struct _PS_PROPERTY_SET
275	struct _ALPC_PROCESS_CONTEXT
294	struct _EPROCESS
948	struct _TERMINATION_PORT
959	union _PS_CLIENT_SECURITY_CONTEXT
969	struct _ETHREAD
1628	struct _PS_WAKE_INFORMATION
1640	struct _EJOB

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