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\tikzstyle{block} = [draw, fill=blue!30, rectangle, 
    minimum height=3em, minimum width=10em, line width = 0.5pt]
\tikzstyle{line} = [draw, -latex']

\def\mfile#1{\node [block, node distance=2.5cm]{#1};
     \draw[line width=0.5pt] (-4.5em,-1.5em)--(-4.5em,1.5em);
		 \draw[line width=0.5pt] (4.5em,-1.5em)--(4.5em,1.5em);}

\begin{tikzpicture}[auto, node distance=2cm,>=latex']

\node [mfile] (test2) {test2};
\node [mfile, right of=go, node distance=3.75cm] (test1) {test1};
\end{tikzpicture} 

\documentclass[parskip=half-]{scrartcl}

\usepackage{tikz}
\usetikzlibrary{positioning}

\tikzset{%
  block/.style={draw,fill=blue!30,minimum height=3em,%
    minimum width=10em,line width=0.5pt,inner xsep=0.7em},
  aussen/.style={inner sep=0pt}}

\newcommand\mfile[1]{%
  \begin{tikzpicture}%
    \node[block,anchor=center]{#1}; 
    \draw[line width=0.5pt] (-4.5em,-1.5em)--(-4.5em,1.5em); 
    \draw[line width=0.5pt] (4.5em,-1.5em)--(4.5em,1.5em);
  \end{tikzpicture}}

\newcommand\mf[1]{%
  \begin{tikzpicture}%
    \node[block,anchor=center](n){#1}; 
    \draw[line width=0.5pt] ([xshift=0.5em]n.south west)--([xshift=0.5em]n.north west); 
    \draw[line width=0.5pt] ([xshift=-0.5em]n.south east)--([xshift=-0.5em]n.north east);
  \end{tikzpicture}}

\begin{document}

\begin{tikzpicture}%
  \node[aussen](test2) {\mfile{test2}}; 
  \node[aussen,right= 3.75cm of test2] (test1) {\mfile{test1}};
  \draw(test2)--(test1);
\end{tikzpicture}

\begin{tikzpicture}%
  \node[aussen](test2) {\mfile{test2}}; 
  \node[aussen,right= 3.75cm of test2] (test1) {\mfile{Ein deutlich laengerer Text}};
  \draw(test2)--(test1);
\end{tikzpicture}

\begin{tikzpicture}%
  \node[aussen](test2) {\mf{test2}}; 
  \node[aussen,right= 3.75cm of test2] (test1) {\mf{Ein deutlich laengerer Text}};
  \draw(test2)--(test1);
\end{tikzpicture} 

\end{document}