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


and draws from it the following type definitions:

Line Number Type Remarks
353 struct _ECP_LIST line 1669 in NTOSIFS.H
700 struct _NONOPAQUE_OPLOCK  
844 struct _WAITING_IRP  
909 struct _RH_OP_CONTEXT  
969 struct _DELAY_ACK_FO  

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