@cecial
Thanks for uploading the entire program not just its Que.exe as i request. That alone would have disclosed nothing to us of course. And yes, i had surmised that it's possible those other .exe files had something to do with allowing the big CH NT to be used. I'd already translated the ReadMe to EN and understood their primary purpose with the shift, but of course it may well be that the Author was aware but didn't want to publicise the fact that somehow the 2GiB file limit is also overcome either intentionally or by accident. Clearly that's not for any big non-CH image files though if my demonstration with EU is definitive.

Like Caty, i'd also be interested to hear if it's only tied to that version of CH CN or if other CH versions and map types 2GiB> are usable.

There are quite vast differences between the three *.exe files in hex. Like looking in for needle in a haystack trying to isolate the 'trigger' which enables the use of that big CH img [for me anyway]. But if found maybe it could be transplanted into Que.exe to enable other large maps. Or Caty's musing may well be right about MPC override and CH language.