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The author of TFA clarifies here: https://news.ycombinator.com/item?id=41651715 https://news.ycombinator.com/item?id=41651715 TL;DR: the spacecraft is indeed

by lisper 2y ago

The author of TFA clarifies here: https://news.ycombinator.com/item?id=41651715 https://news.ycombinator.com/item?id=41651715 TL;DR: the spacecraft is indeed not running Windows. It's running a custom OS written in C.