https://bugs.winehq.org/show_bug.cgi?id=54890
--- Comment #17 from Rafał Mużyło galtgendo@o2.pl --- If the error you're referring to is the one in 'public MainForm()' (from https://github.com/jewalky/UltimateDoomBuilder/blob/master/Source/Tools/Upda...), that 'bool CheckPremissions(string path)' looks like something that could hit an unimplemented path or two, though that's just a guess and I'm unsure which debug channels you should be checking to verify...
Anything interesting in the common console output there ?