Unsigned Extension Mac - Empty Nested Directories (/_MACOSX/**Plugin Name**/)

When installing some .rbz file type Extensions I get some empty nested directories (/_MACOSX/Plugin Name/) in the location below.

~/Library/Application Support/SketchUp 2017/SketchUp/_MACOSX/Plugin Name/

Is this because the Extension is Unsigned? Is it some implementation of my code?

I see the _MACOSX folder sometimes when passing zip files via dropbox, or a server. I think it’s not needed at all, and doesn’t mean anything in particular.

Here’s an article about it: http://gotoes.org/sales/Zip_Mac_Files_For_PC/What_Is__MACOSX.php

This is something OSX adds (somewhat annoyingly.)
You observer this with your own extension that you make? If so, how to you go about creating your RBZ files?

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