As easy as it is to ignore the difference in these days of cross-platform development toolchains and environments, they still are very different operating systems under-the-hood. As opposed to OSX and Linux, which are both rooted in a UNIX past and therefore have some shared assumptions about how things like a directory structure and process management are supposed to work.

That's a good point. It was probably easier to port it to Linux. I can't see why they would intentionally avoid Microsoft (at least not at this point in their history).