https://bugs.winehq.org/show_bug.cgi?id=38290
--- Comment #1 from Nikolay Sivov bunglehead@gmail.com --- Hi, Enrico.
Please update your Wine first, 1.6.2 is very old.
(In reply to Enrico Segre from comment #0)
when setup.exe is run from desktop without particular wineprefix
You always run with some wineprefix, even if you don't specify it explicitly.