forest styling - Horizontal tree similar to a folder tree

Question

I would like to obtain the following formatting for a tree with the excellent package forest only. Maybe the example in page 82 of the documentation or this other post could be a starting point.

Here is the code for a horizontal standard tree.

\documentclass[12pt,a4paper]{article}
\usepackage{forest}
\begin{document}
\begin{forest}
    for tree = {%
        grow'  = 0,
        l      = 2.5cm,
        parent anchor=east,
        s sep  = 1.2cm,
    },
    [
        [A
            [B]
            [C
                [D]
                [E]
            ]
        ]
        [F]
    ]
\end{forest}
\end{document}

Answer 1

With plain tikz

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning,calc}
\begin{document}
\begin{tikzpicture}
\draw[line width=2pt] (0,0)node(a){}--(12,0)nodefill=white{B};
\node[fill=white]at ($(a)!0.50!(B)$) (A) {A};
\node[fill=white, below=of A, yshift=-4cm] (F){F};
\draw[line width=2pt] ($(a)!0.10!(B)$) |-(F);
\node[fill=white, below=of B, yshift=-1cm] (C){C};
\draw[line width=2pt] ($(a)!0.60!(B)$) |-(C);
\node[fill=white, right=of C, xshift=2cm] (D){D};
\draw[line width=2pt] (C) --(D);
\node[fill=white, below=of D, yshift=-1cm] (E){E};
\draw[line width=2pt] ($(C)!0.20!(D)$) |-(E);
\end{tikzpicture}
\end{document}