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Microsoft is not the developer here, it has been outsourced to a game studio : https://www.asobostudio.com/games/microsoft-flight-simulator

But the remark still stand, and I hope OP has been correctly credited for it.

Thanks, I have mentioned this fact at the bottom.

Strange that Microsoft's contractor used OP's project in their game, but didn't bother to let him know.

Why is that strange?

Do you contact the authors of every one of your dependencies before using them in your works?