James, I think you can (and ought to) remove all the files with named "Simutrans-Experimental*" - they seem to be just a waste of space and effort now. Do you agree?
Thank you for the suggestion: now done. I should be grateful if you could let me know if I have missed any.
I think Simutrans-Experimental-Server-BG.vcxproj, Simutrans-Experimental.vcxproj.filters and Simutrans-Experimental.vcxproj.user are also obsolete?