KE_X.H

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

d:\th\minkernel\ntos\inc

and draws from it the following type definitions:

Line Number	Type	WDM.H	NTIFS.H	NTOSP.H
104	enum _KINTERRUPT_MODE	19459		12950
111	enum _KINTERRUPT_POLARITY	19466		12957
141	enum _KWAIT_REASON	19494		12985
196	struct _KAPC_STATE		13124	13040
227	struct _KWAIT_BLOCK	19539		13069
276	struct _KDEVICE_QUEUE	19584		13114
300	struct _KDEVICE_QUEUE_ENTRY	19608		13138
353	struct _ISRDPCSTATS
366	struct _KINTERRUPT
471	struct _KMUTANT	19647		13178
486	struct _KQUEUE		13144	13187
497	struct _KPRIQUEUE			13195
514	struct _KSEMAPHORE	19662		13209
1293	struct _KSTACK_CONTROL
3342	enum _MEMORY_CACHING_TYPE_ORIG	21169		15566
3346	enum _MEMORY_CACHING_TYPE	21173		15570
3577	struct _XSTATE_SAVE	21345		15776
3678	struct _EXT_SET_PARAMETERS_V0	21409		15847
3735	enum _KTIMER2_TYPE
3802	struct _KTIMER2
3937	struct _KWAIT_CHAIN	21481		15940

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