https://bugs.winehq.org/show_bug.cgi?id=53630
--- Comment #12 from Jim JSladek@juno.com --- Concur. FoxProW was around a long time before .NET. wine-mono had been installed all the way along, but when FoxPro was brought up for the first time after the update to 7.20, the error message came up prompting the installation of wine-mono.
I think I can restore one of my systems to the configurarion before the update to wine 7.20 - I will try to do that tomorrow in konsole to see if any clue to the behavior comes out.