Now your my-windows10.qcow2 is reusable.

Cloudbase.it offers Windows images that can be used or converted to .qcow2 format.

For developers, QA engineers, and cybersecurity researchers, the .qcow2 format combined with Windows 10 gives you a portable, snapshot-able, and high-performance virtualization environment that rivals native hardware.

Downloading a image is a specialized task typically used by IT professionals, developers, and virtualization enthusiasts running QEMU/KVM environments on Linux or Android. Because Microsoft does not officially distribute Windows 10 in the .qcow2 format, users must either build their own from an official ISO or rely on third-party downloads, which comes with significant security and performance considerations. The "Convenience" of Pre-Built Images