In the world of virtualization and system administration, efficiency is king. Setting up a virtual machine (VM) from scratch—inserting an ISO file, partitioning drives, and sitting through the lengthy installation process—is a rite of passage for IT professionals. However, once you have done it a dozen times, the novelty wears off.
Introduction
Windows Evaluation VMs: Microsoft offers 90-day trial VMs for developers, though these are usually in VMware (.ova) or Hyper-V (.vhdx) formats. You can easily convert these to .qcow2 using the qemu-img utility. How to Create Your Own Windows 10 .qcow2 Image Windows 10.qcow2 Download
A Windows 10.qcow2 file is essentially a pre-installed or install-ready virtual hard disk containing Windows 10. The Complete Guide to Acquiring and Using "Windows 10