Well native windows definitely isn't POSIX. I might go against the opinions on this board, but I personally believe that MS got a lot more right about OS API's

Well native windows definitely isn't POSIX. I might go against the opinions on this board, but I personally believe that MS got a lot more right about OS API's in windows than POSIX provides with its lowest common denominator. Frequently the POSIX API's that have tons of under-specified behaviors that aren't obvious at first reading. Particularly when viewed through a multihreaded/async paradigm. Many of the nonstandard linux/bsd/etc API's are there to address major shortcomings in POSIX which one frequently discovers aren't problems with the windows equivalents. Sure CreateFile() has a lot more parameters than open() but it frequent turns out to be useful functionality if your writing more than introductory applications.