ZMPP working for Glulx?

I’m trying to get ZMPP to play Glulx games, but I’m not having any luck. I can open and run .z5 files okay, but when I try to open either a .ulx or a .gblorb, I just get a blank white screen-- no error messages, but no game either.

I’ve downloaded the file from the Sourceforge page, although I notice there’s also a “Glulx Preview” directory that’s empty. Is Glulx support still in the works for ZMPP or has it actually been added? (If not, there is no working Java implementation of modern Glulx, correct?)

You are looking for ZMPP2, which added Glulx support.