Those toolkits would usually reimplement the "native" look and feel from scratch, or nearly so. It was uncommon to rely directly on the basic OS widgets.

MFC was Microsoft, so that was definitely native, and I think a lot of stuff used native even just for performance reasons. I remember getting very frustrated around then when something would want me to install the JVM and I knew I was in for a laggy mess of an application that would have bad font rendering, strange little buttons, and its own file picker.