Proxmox uses Qcow2 as its default. Upload your image via the web GUI: Local storage → Upload . Then create a VM and attach the Qcow2 as a disk. You can enable and discard options to free trimmed space back to the host.
Many community-built Lite ISOs are not digitally signed by Microsoft. Always download from reputable sources or build your own using tools like MSMG Toolkit or NT Lite to avoid malware. Windows 10 Lite Qcow2
: Windows doesn't support QEMU hardware natively. You must install VirtIO drivers for the disk and network to get full speed. Proxmox uses Qcow2 as its default
Setup recommendations (VM-focused)
: virt-install --name win10 --ram 2048 --disk path=win10_lite.qcow2,format=qcow2 --cdrom /path/to/lite.iso 3. Converting an Existing VM Windows 10 Lite Qcow2