This would be a possible way to fix the encoding of special characters, but it doesn't work.
<Convert>
<ConvertFromSMathToMaxima>
<Expression regex="\\0020\\" replace=" "></Expression>
</ConvertFromSMathToMaxima>
<ConvertFromMaximaToSMath>
<Expression regex="RegualarExpression" replace="ReplaceExpression">Your Maxima functions for SMath</Expression>
</ConvertFromMaximaToSMath>
</Convert>
