Don't be lazy and work in your code as someone else has to maintain it.

I thought it was just a myth lol each operating system has a codename, why use public name?

@crisz Answer: bad programmers.

@erikdreyer11 Some devs had that piece of code, that checks if the windows version starts with 9, in order to determine if their software was being ran under Windows 95/98 so there is a rumor that Microsoft skipped Windows 9 in order to maintain compatibility with those programs.