Windows/MS-DOS had file extensions (which it inherited from CP/M) before it had directories and directory separators.
Did CP/M and Unix independently come up with file extensions with a dot separator, or did they acquire it from the same source? I'm dimly aware of other operating systems that use(d) a different character (AS/400?), but it's outside my ken.
Did CP/M and Unix independently come up with file extensions with a dot separator, or did they acquire it from the same source? I'm dimly aware of other operating systems that use(d) a different character (AS/400?), but it's outside my ken.