https://bugs.winehq.org/show_bug.cgi?id=56304
--- Comment #4 from Austin English austinenglish@gmail.com --- (In reply to amidevous from comment #3)
Which means that any bugs that have been reported must be resolved before you release a version on the stable branch.
There is no such guarantee, there are literally thousands of bugs to fix, and limited developer time/resources.
It is guaranteed that 100% of Windows programs are functional.
Where did you get that idea from?