Mac build not working on Windows

Hey guys,
I have a problem with building a mac application on Windows: I’m trying to build my project, I select a folder for the build and after that I have a folder called “MacBuild.app”. Can you tell me what I have to do? Do I have to put the files of “MacBuild.app” into a zip file and rename it from “zipfile.zip” to “zipfile.app”? I’m not able to try out if it works, because I have a Windows machine. Maybe I should say that I’m using Unity beta version 5.5.0b3.
Thanks!

Nearly right, but don’t rename the archive - just send the entire ZIP file over to a Mac user and OSX will extract/run it.