Hmm... no. I'm testing it on native Windows and "windowBorder = yes" changes something, but there's no bar at the top like you'd have on this internet browser window. All it really changes is I can see the Windows taskbar at the bottom instead of RetroFE covering it.
edit: aaaaaaah, but it works correctly on wine! Thanks a lot! The one thing is, I can't close RetroFE with the close button on wine, nor on native Windows if I right click at the taskbar > Close Windows.
edit: To be clear, for Windows users who'd wish to drag the RetroFE windows, perhaps from one monitor to the next, at least on my end this doesn't render that on a native Windows installation. But for my specific case, through wine, it does.