This blog post is going to demonstrate how to implement a new feature added to Packer in version 1.6.3. This new feature provides the ability to mount multiple ISOs on Proxmox VMs because Proxmox “doesn’t” support virtual floppy drives. Since Proxmox doesn’t support virtual floppy drives you can’t supply an Autounattend.xml file to automate the installation and initial configuration of Windows. By converting an Autounattend.xml file to an ISO we can now mount the ISO to install the OS and the ISO containing the necessary file to automate the installation. Lastly, I will be using Vault to store my sensitive values required by Packer to create this VM.