go/doc/next/6-stdlib/99-minor/os/15388.md

On Windows, [NewFile] supports overlapped (a.k.a non-blocking) file handles even when the handle can't be added to the Go runtime I/O Completion Port (IOCP), normally because it is already attached to another IOCP. The I/O operations will be performed in a blocking manner instead of using the Go runtime IOCP. Particularly, this means that is now possible to reliably pass overlapped named pipes and sockets to a Go process standard input, output, and error.