And then you have your choice of networking via eg SLIP or (more sanely lol) a program that can mount VHDs offline.
Do you have to install a tool that modifies the internals of your OS in order to see how it could look like? Imagine if you had to set up a painting on your wall before you could even see what it's a painting of.
For retrobar, at least, there is a screenshot on the first line of the readme (it really does just look like the windows XP, windows 98, etc. taskbar nothing special going on).
I'm still on Win10, but I use WindowBlinds to skin it to look like Win2K. Eventually, when I upgrade my CPU, I'm going to need Win11 to get the Intel Thread Director, so I know I'm going to need to either buy a new version of WindowBlinds and Start11. Would be nice to run a FOSS alternative.