Shark biting an undersea cable

You don’t say what mode you have the enclosure set to. If you have it set to software control mode, only Windows is supported and it’s going to do some weird proprietary stuff that needs the qnap software.

This isn’t a Valve project

Surprised there is no mention of the eXoDOS collection here. It has thousands of DOS games that run through a launcher with tuned emulation settings for each title.

Personally, I like playing with real hardware but this is probably the best option right now for a jukebox style experience on a modern PC.

You should be able to do everything through the web interface.

You can make network shares by creating shared folders under Storage->Shared Folders then configure your Windows shares through Services->SMB/CIFS

Install the openmediavault-compose plugin to manage your docker containers.

I would also suggest installing the openmediavault-wireguard plugin for secure remote access to your services from outside your network.