"Return_..." is right: in future, PLEASE LEDE WITH THE AFFECTED OS.
If your point is that this COULD as easily be a Mac payload (which, yes, it could, but it's not, & since you can't detect the chat-recipient's OS or user-agent via FB chat it would be a waste of effort to make it a Mac payload), you should MAKE that point, which you don't.
@bobp: It implicitly (also bad, it should be CLEAR) establishes that this is a Windows exploit -- not where they say the executable is stored.
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