Linux

It all boils down to how such games (and softwares, in general) depend on dependencies. Imagine two teachers, both of which lectures to several students. One of these teachers are a mathematician, and the other teacher is an engineer. The first depends on math books, the latter depends on engineering books. Sure, there are mathematical aspects to engineering, as there are engineering aspects to math sometimes, but a math teacher can't use engineering books to lecture, while the engineering teacher can't use math books to lecture. They need their own set of books, even though these sets can overlap sometimes.

That's a similar situation to Windows and Linux softwares: one depends on Windows set of books, while the other depends on the Linux set of books. You can't just "import" the Windows books into the Linux classroom, because the classroom will also change: back to the analogy, the engineering classroom has engineering instruments and equipment, while the math classroom has scientific calculators and computers running R and Wolfram Mathematica.