Windows has definitely improved over the years, and is currently the leading consumer operating system. However, there's one feature which has been around since NT 4.0 (released in 1996), and has not improved. I'm talking about the Environment Variables windows. It lets you set environment variables such as PATH, and for 16 years now has been based on a single-line input box.
Since this box often times contains multiple entries, such as for PATH where entries are semicolon-separated, and since software design and user experience have matured significantly since 1996, it is UNACCEPTABLE that this box remains single-line, and not resizable. Sure, I copy the contents out to a Notepad-like application, and then paste the modified result back in, but I really shouldn't have to work around it.
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