HorizonTGCB

A containerized app does not need a VM because it shares the kernel with the host OS. You an run Linux apps in a container on Proxmox because Proxmox has a Linux kernal. But if you want to run Windows apps, you need a Windows kernel.

There is a thing called Windows Container, but it can only run on a Windows host.

https://learn.microsoft.com/en-us/virtualization/windowscontainers/about/