What is a ghz file, can we create our own if GH does not host our country?

The ghz files on the Graphhopper site at download2.graphhopper.com/public/maps/0.13 do not include maps for New Zealand. I’m trying https://download2.graphhopper.com/public/maps/0.13/oceania/new_zealand.ghz
What is a ghz file, is it just a zip of the osm file, can I make my own and then host it somewhere so I can download ?
I’m using this with the offline VTM grapphopper demo found here https://github.com/graphhopper/graphhopper/blob/master/android/README.md

See the linked documentation on how ghz files can be created on your own: https://github.com/graphhopper/graphhopper/blob/master/docs/android/index.md#maps

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apologies for my newbie-ness, does the graphhopper.sh file need to be run on linux? I’m on windows

For windows usage you need cygwin:

(or for windows 10 there is also WSL where it should run without additional software)

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