\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}[%
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	% 	two children at (0.5,-0.7) and (0.5,-1.4)},
	% edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
	% \node {/ or C:}
	% child { node {home}
	% 	child { node {knut}
	% 		child { node {pictures}}
	% 		child { node {docs}
	% 			child { node [foot] {latex}
	% 				child { node [rel] { main.tex}}
	% 				child {node [foot] {sections}
	% 				child { node [selected] {part1.tex}}
	% 			}
	% 			}
	% 		}
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	\begin{tikzpicture}[%
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			two children at (0.5,-0.7) and (0.5,-1.4)},
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		\node [foot] { latex-skript }
		child { node [rel] {main.tex} }
		child { node {praeamble.tex}}
		% child { node { listings}}
		child {node [foot] {content} 
			child { node [selected] { basic-document-structure.tex}}
			child { node { basic-functionality.tex}}
			child { node { ... }}
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		child [missing] {}
		child [missing] {}
		child [missing] {}
		child { node {exercises}
			child { node { graphics }
				child { node {graphics.raw.tex}}
				child { node {task.tex }}
				child { node {...}}}
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			child [missing] {}
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			child { node { footnotes}
				child { node { footnotes.raw.tex }}
				child { node {task.tex}}
				child { node { ...}}}
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		% child { node {...}};
		\end{tikzpicture}
\end{document}