Is this just a PC build? i can't seem to find the Mac version, it's labelled up as such though. Thoughts?
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I would be surprised if the build for Windows and Linux were the same. If you can run the Windows exe file on Linux, that would be courtesy of having Wine installed, so there would be some sort of Windows-emulation underneath.
OTOH making a real native Mac and Linux build isn't hard either, just install the modules for it (if you haven't done so already), and then switch between the target platforms in the build settings dialog.