+use relative instead of absolute paths. For wxFileConfig, you can also
+add wxCONFIG\_USE\_NO\_ESCAPE\_CHARACTERS which will turn off character
+escaping for the values of entries stored in the config file: for example
+a {\it foo} key with some backslash characters will be stored as
+\begin{verbatim}
+ foo=C:\mydir
+\end{verbatim}
+instead of the usual storage of
+\begin{verbatim}
+ foo=C:\\mydir
+\end{verbatim}
+The wxCONFIG\_USE\_NO\_ESCAPE\_CHARACTERS style can be helpful if your config
+file must be read or written to by a non-wxWindows program (which might not
+understand the escape characters). Note, however, that if
+wxCONFIG\_USE\_NO\_ESCAPE\_CHARACTERS style is used, it is is now
+your application's responsibility to ensure that there is no newline or
+other illegal characters in a value, before writing that value to the file.}