Need help to understand non-linux (Windows) branch in go-runc

Hi, I'm new to go-runc and trying to learn go-runc from reading the docs and source code.

I noticed there is code for non-linux (Windows) branch in multiple places.

https://github.com/containerd/go-runc/blob/main/command_other.go
https://github.com/containerd/go-runc/blob/main/io_windows.go

I'm wondering what is the use case of having non-linux branch in go-runc. My understanding is go-runc is a wrapper for runc and runc is linux-specific. Windows container runtime has a separated repo [hcsshim](https://github.com/microsoft/hcsshim) to be used by containerd. So why does go-runc need windows branch? Does go-runc/runc have the plan to support Windows container?