Well no, the language has nothing to do with the operating system. Or maybe by Windows binary code you mean machine code, which is x86_64 on most PCs. It’s not hard per se, too, it just takes a while to absorb all of the topics (I’ve been building my own for a while now).
(To pizzaveloper) Ultimately, a language is nothing more than a document which describes how it works. An example may include the C standard specification, which you can find online. Now if you wish to create a program that reads source code of your language and does something with it, you need to look up compiler or interpreter design, and read books on those. This is a very deep rabbit hole, so you should be well aware on what you’re getting yourself into.