https://bugs.winehq.org/show_bug.cgi?id=41700
--- Comment #8 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to Dmitry Timoshkov from comment #7)
(In reply to Alex Henrie from comment #5)
Created attachment 56119 [details] Windows XP screenshot
(In reply to Dmitry Timoshkov from comment #3)
Actually Python 3.5 installer should work under XP too
The attached screenshot shows that it does not. Wine's Windows XP behavior is correct.
It looks like the supported Windows version requirements have changed starting from the Python 3.5.1 release. I've attached a screenshot of Python 3.5.0 installer startup screen running under XP, it matches the Wine one.
If I recall correctly since when I looked at this problem last time the source of the problem is that the Python installer (or rather WIX) uses invalid style for the "Button" window class which leads to a failure in repainting the window.
Probably WIX depends on another quirk between user32 and comctl32 in the "Button" class implementations. See for another example of a similar painting issue bug 29921, it has a test case with source attached.