How to create a non-windows VHD container?

Question

linux

You need to create a VHD container that will be used on a flash drive and Windows will be installed there. That is, I will have Windows on a flash drive completely in this container itself.
I don't have Windows anywhere right now. I have mac and linux.
Question - how to create such a VHD container with windows or for windows from under poppy or Linux ? Is this even possible or do you need to create it only from Windows itself?
I read about such containers and it seems like this is possible only from Windows itself.

Answer 1

xgu.ru/wiki/qemu-img
https://linux.die.net/man/1/qemu-img
qemu is for everything. Supports the creation and conversion of many things
raw, qcow2, qcow, cow, vmdk, cloop, vpc (VHD).
Perhaps even vhdx has already been brought up.

Answer 2

Oracle VirtualBox, vboxmanage utility, createmedium disk --format vhd option, other options to taste. And then you will install Windows on it later, mounting it to no one knows where.

Answer 3

You can create an open format anywhere. If you find a utility that works under the desired OS and can create VHD - no problem.
It's just not clear what is the point of an empty container?
That's when you will put it, and create a container.

I read about such containers and it seems like this is possible only from Windows itself.

Not true.
A container is a regular file that has a certain structure. In the public domain there are clear specifications for the structure.
Therefore, you just need to create a file and write some known data into it, that's the creation of the container.
I haven't seen an OS that can't write files.