MacOS works with the following file extensions: MacBook/MacBook (Retina): late 2009 or newer.The information about older OS X system on are available here. However, more and more specilized engineering and scientific software are also available for macOS. Most applications for Macs are used by home and office users, students and creatives. It is distributed as a free upgrade through Mac App Store. The first version of is called macOS Sierra and it is successor of OS X El Capitan. MacOS (previously Mac OS X) is Unix-based desktop operating system for iMac, MacBook, MacBook Air, MacBook Pro, Mac Mini and Mac Pro computers, developed by Apple, Inc.
