But a big drawback that all WMV files have is their incompatibility with macOS. Every time Mac users try to open a WMV file with the default QuickTime player they receive an error message informing that ‘This is not a movie file’. Don’t be angry over it. Your player just notifies you that it can't play WMV on Mac. This format uses Microsoft proprietary codecs not available for Mac computers. To watch WMV files on Mac you need to install a different media player software. The best WMV player for your Mac computer is Elmedia Player.