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Well, there's WINE, but it's relatively hit or miss, whether specific applications will work in it.
Containers can't work conceptually, because they use the kernel of your host system and a Windows application expects a Windows kernel (or at least an interface like WINE, which answers its calls).
Theoretically, there's also the option of a VM with ReactOS, but my impressions has been that it works less often than WINE.
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/
If the app runs correctly in Wine you might be able to rig something together with that.