\let\a:txt:textcolor\a:textcolor
\let\b:txt:textcolor\b:textcolor
\Configure{textcolor}
{\ifmathml
\Configure{color}%
{\Configure{SetHColor}
{\HCode{<m:mstyle color="\HColor">}}}%
\else \a:txt:textcolor \fi
}
{\ifmathml \HCode{</m:mstyle>}\else \b:txt:textcolor \fi}
-_-_-