\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{tikz}
\usetikzlibrary{trees}
\usepackage{verbatimbox}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}
\begin{document}
	\tikzstyle{every node}=[draw=black,thick,anchor=west]
	\tikzstyle{selected}=[draw=red,fill=red!30]
	\tikzstyle{foot}=[fill=gray!50]
	\tikzstyle{rel}=[fill=blue!70]
	\tikzstyle{partition}=[draw=white]

	\begin{tikzpicture}[%
	grow via three points={one child at (0.5,-0.7) and
		two children at (0.5,-0.7) and (0.5,-1.4)},
	edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
	\node { latex-skript }
	child { node {main.tex} }
	child { node {praeamble.tex}}
	% child { node { listings}}
	child {node {content} 
		child { node { basic-document-structure.tex}}
		child { node { basic-functionality.tex}}
		child { node { ... }}
	}
	child [missing] {}
	child [missing] {}
	child [missing] {}
	child { node {exercises}
		child { node { graphics }
			child { node {graphics.raw.tex}}
			child { node {task.tex }}
			child { node {...}}}
		child [missing] {}
		child [missing] {}
		child [missing] {}
		child { node { footnotes}
			child { node { footnotes.raw.tex }}
			child { node {task.tex}}
			child { node { ...}}}
	};
	% child [missing] {}
	% child [missing] {}
	% child [missing] {}
	% child [missing] {}
	% child [missing] {}
	% child [missing] {}
	% child [missing] {}
	% child [missing] {}
	% child { node {...}};
	\end{tikzpicture}
\end{document}