We all know that parts of a system that are used the least are generally the worst. They get the least attention and have the lowest priority when triaging bugs. In some cases they are so rarely seen that they don’t even get bug reports written about them. Vide the now notorious Windows 3.x font addition dialog that lasted until Windows Vista.
Here is a less egregious example from Windows 10 (current version, 1511):
Note the background color problem under the permissions section of the dialog. I suspect that it has been there since Windows 98 or something. If it was removed, this would look fine. Maybe in the next version of Windows, the anniversary update, they will improve this?
I am not mentioning the UNIX style permissions because that is a function of the FTP server, rather than the Windows FTP client.