\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 {/ 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}}
				}
				}
			}
		}
	};
	\end{tikzpicture}
\end{document}