the file is part of a software framework which apparently all work carried out for the next release of Apple’s desktop operating system. If Apple OS X renames Mac OS revives the old times. Until the launch of Mac OS X, the system was called even all Mac OS. According MacBrazil gets the successor to OS X 10.11.4 El Capitan or another notation: MacOS. That style is consistent with Apple’s other operating systems. IOS, tvOS and watchOS

That Apple waives the letter X in the name of its operating system, is not very surprising. The X stands for the Roman ten and now Apple is already quite long with ten version of the system busy. The first release was Mac OS X 10.0 Cheetah in 2001, now we are at 10:11. Incidentally, the X was in 2001, also for Unix. With the advent of OS X, Apple did away from the base of his old operating system and made the transition to a new system based on Unix. The move was due to the return of Steve Jobs at Apple. His previous company NeXT made the Unix-based NeXTSTEP. That, then acclaimed operating system, eventually became Mac OS X