Calc.exe is now open source; there’s surprising depth in its ancient code (2019)
This is the "modern" one with the egregiously bloated UI (including a loading screen!) and telemetry... but funny that it's using the same calculation code. Of course they still managed to screw it up somehow: <a href="https://news.ycombinator.com/item?id=17670644" rel="nofollow">https://news.ycombinator.com/item?id=17670644</a><p>In one of the old Win2k source leaks the code can be found for the far more efficient "classic" one.<p>Also, title needs (2019). There are some other HN articles from around that time discussing it: <a href="https://news.ycombinator.com/item?id=19321217" rel="nofollow">https://news.ycombinator.com/item?id=19321217</a>