Well yes, yes they did. It is called Canoe and is for example running inside the SNES Classic Mini. And that is not the only emulator they wrote. Writing an emulator is not some obscure magic, and it is way easier if you own all the schematics and other Information used to build the original hardware.
When I got into the company I was allowed to use Linux. But a few years ago the company was bought and merged with a much bigger company and the new IT policy made Windows mandatory.