Came across this article from a decade ago <https://www.samba.org/samba/news/articles/low_point/tale_two_stds_os2.html> about the evolution of the POSIX and Win32 standards from the viewpoint of a veteran who earned his scars in the trenches. While POSIX got one or two things spectacularly wrong (e.g. the disaster that is file locking), it got a lot of things right (e.g. abstracting data types for file offsets/sizes, timestamps etc). Wonder why WINE has taken so long to get to where it is? It’s because nobody can be quite sure they have flushed out every last wrinkle of the behaviour of every Win32 API call.