also if you're making a zip let somone else (on windows) re zip it because They end up like MACOSX?/SOMETHING
MACOSX file is impossible to remove on a mac. Deal with it.
Why does the mac do that? To show that the .zip was made with a mac?
I think its extra data for mac, but windows will show hidden files on mac, and they don't need the data.
It helps Finder by giving it extra data (eg. the date the files were created, etc.).