verilog header files in Qsys component editor

I am trying to use the Qsys component editor to create an instance of one of my verilog files to use in Qsys.

I have a header file (registers.vh) that has the definitions for a number of `defines that are used in the verilog file. I haven't figured out how to tell Qsys component editor where to find this file. When I try to analyze the RTL files I get the error message:

Error: Verilog HDL File I/O error at meas.v(51): can't open Verilog Design File "registers.vh" File: /abaxis/engine ii/fpga/custom/meas/hdl/meas.v Line: 51

I tried adding the file to the synthesis files list but that didn't help

How do I deal with this?

Thanks

Rod