Return the directory for the user config files:
\begin{itemize}
\item Unix: \tt{~} (the home directory)
- \item Windows: \tt{C:$\backslash$Documents and Settings$\backslash$\textit{username}}
+ \item Windows: \tt{C:$\backslash$Documents and Settings$\backslash$\textit{username}$\backslash$Application Data}
\item Mac: \tt{~/Library/Preferences}
\end{itemize}