DlgDirList

[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Ansi)]
public static extern int DlgDirListA(IntPtr hDlg,
   [MarshalAs(UnmanagedType.LPStr)] StringBuilder lpPathSpec,
   int nIDListBox,
   int nIDStaticPath,
   uint uFileType
);

Microsoft documentation: Link