Sumit is correct. Windows is basically built on top of all the years earlier regardless of what Microsoft may say as they did not recreate all of Windows from scratch or stop using older styled ways lol.
It could technically look like MS DOS at some point too :)
Not really anything to think about but its possible that your computer had a crash. That could be from a Windows bug or it could be that your Windows installation or computer has an issue.
You can look in Windows reliability history or wherever to see if something happened.