what build.zip file? there is none. also the reason i wanted to open the index html file was to put it in the itch.io project i was making because it would only show a blank screen
from the menu: Project > Build Archive should create a build.zip file in the distrib folder of your project.
This archive can be uploaded as-is to Itch.io. Don't forget to check the "This file will be played in the browser" on the itch page:
thx for help