> A windows binary that starts a Linux VM in which the container runs.
I'm afraid my wording was somewhat ambiguous here. I meant to ask "do you aim to wrap Windows apps in a single Windows binary", but I suppose you answered my question anyway. You want to distribute Linux applications to Windows users.
Running on Windows/macOS was also the context in which I meant to ask about filesystem mounts. I understand this is not something that's implemented yet, but I'm wondering about your goals. Things obviously get much trickier than they are on Linux. On Windows I'd probably include a Plan9 server for file sharing.
The much larger hurdle I see for Windows support is that I don't think you can setup virtualization without Admin privileges in the general case. If Hyper-V is not already present and enabled you'll need to install some hypervisor. Even QEMU needs Hyper-V for proper virtualization.