Yeah, but in Windows it's usually supported officially (and documented) and you know they won't completely pull the rug out from under you on the next release. Apple on the other hand will break the API without even telling anyone. How could you depend on such a company?

Anyway, talk is cheap - have a look at all of the shell extensions you can build with Windows and compare them to what you can do in OS X: https://msdn.microsoft.com/en-us/library/windows/desktop/cc1...