\documentclass[tikz]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\usepackage[edges]{forest}

\newcommand{\code}[1]{\texttt{#1}}

\begin{document}
\begin{center}
\small
\begin{forest}
	for tree={
		folder,
		grow'=0,
		fit=band,
		l sep=30pt,
		s sep=0pt,
		edge path={
		\noexpand\path [draw, \forestoption{edge}] 
		([xshift=20pt]!u.south west) -- +(0cm,0) |- (.child anchor)\forestoption{edge label};
		}
	}
	[\code{<caseDir>/}
	[\code{settings.in}]
	[\code{preproc-log.dat}]
	[\code{reference-output.dat}
	]
	[\code{cubes/}
	[\code{general-info.dat}]
	[\code{cube-data.<i>of<nDecompCubes>.bin}]
	[...]
	]
	[\code{geometry/}
	[\code{file1.stl}]
	[...]
	]
	[\code{stats/}
	[\code{binary/}
	[\code{stats.<i>of<nDecompCubes>.bin}]
	[...]
	]
	[\code{vtk/}
	[\code{stats.<i>of<nDecompCubes>.vtk}]
	[...]
	]
	]
	[\code{database/}
	[\code{binary/}
	[\code{it-<it>/}
	[\code{field.<i>of<nDecompCubes>.bin}]
	[...]
	]
	[...]
	]
	[\code{vtk/}
	[
	\code{series/}
	[\code{cube.<i>of<nDecompCubes>.vtk.series}]
	[...]
	]
	[	
	\code{it-<it>/}
	[\code{field.<i>of<nDecompCubes>.vtk}]
	[...]
	]
	[...]
	]
	]
	[\code{restart/}
	[\code{restart.<i>of<nDecompCubes>.bin}]
	[...]
	]
	]
\end{forest}
\end{center}

\end{document}

