Something is alien somewhere, and as others noted, for Windows specifically I couldn't tell you what native is. On Linux there's just GTK and Qt, but the count

Something is alien somewhere, and as others noted, for Windows specifically I couldn't tell you what native is. On Linux there's just GTK and Qt, but the count is far higher on Windows these days. I have a Qt app that blends in imperceptibly well in my eyes, while some of MS own software stands out. Point is: there is no such thing as native.