I remember seeing a tool acts the same way as Windows does on extracting zip files. I suggest that you should ask this question on the Macintosh forum.

I'm assuming that you're talking about your MM32 freebie and here is what I did to install it manually:

1. Extract the zip files of the freebie.
2. In the freebie folder, I go to the pose folder and move the mirrormags32 folder into my Runtime-library-pose folder.

That's basically it.

-Lee