On mac it's a bit harder, because in it, the files and folders are within the game.app folder(if i'm not mistaken thats the name when you export your game for MacOS). You would need to export for web browsers, download NW.js last version for macOS, find a way to open the nw.app as folder within macOS, then follow those steps to distribute your game:Brilliant! any hints about how to do the same on a Mac?
http://docs.nwjs.io/en/latest/For Users/Package and Distribute/#mac-os-x
For those interested, last version of NW.js brings V8 7.2(MV 1.6.2[Last Version] uses 6.5, also using chromium ver 72[MV uses 65]) . The difference in performance should be quite visible for those who upgrade from MV's version to the last one. Mainly for async stuff.