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


and draws from it the following type definitions:

Line Number Type
26 struct _RTL_RANGE
67 struct _RTL_RANGE_LIST

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