WinForms is much more recent than that. It was introduced along with the .NET Framework around 2000.
The original classic controls were implemented in USER.EXE (which was actually a DLL) starting in Windows 1.0 around 1985. WinForms wrapped these controls and others in a .NET interface.
The original classic controls were implemented in USER.EXE (which was actually a DLL) starting in Windows 1.0 around 1985. WinForms wrapped these controls and others in a .NET interface.