It is an demo of enabling Aero on Windows 10 using hidden APIs and it's written in Kotlin Native.
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https://gist.github.com/ysc3839/b08d2bff1c7dacde529bed1d37e85ccf
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https://blog.ysc3839.com/archives/2017/10/win10-aero-undocumented-api.html
WTFPL