Using the qemu-img utility (available on Windows, Linux, and macOS via Homebrew):
# Convert from VDI to QCOW2 qemu-img convert -f vdi -O qcow2 Windows10.vdi Windows10.qcow2 qemu-img convert -f vmdk -O qcow2 Windows10.vmdk Windows10.qcow2 Convert from raw IMG or VHD qemu-img convert -f raw -O qcow2 Windows10.img Windows10.qcow2
You now have a portable, legal, malware-free windows10.qcow2 file. Part 5: One-Click Download Options (Third-Party Repositories) If you truly do not want to create your own, a few trusted open-source projects provide automated build scripts or pre-built images for open-source Windows alternatives (like ReactOS). For actual Windows, the only reputable third-party source is OSBoxes (Linux-focused VM distribution) – but even they typically provide .vdi for VirtualBox.
