I have just taken a first look at format of the XML files in which kspread
saves its data. Syntax coloring emacs helped me find that a \" is missing in:

1889    out << " float=\"" << (unsigned int)floatFormat() << "\" floatcolor="
1889  << (unsigned int)floatColor()
1890        << "\" faktor=\"" << m_dFaktor << "\"/>" << endl;    

directly after "floatcolor=". (snapshot 28-01-1999)

I hope to come up with something more exciting next time. (I intend to find a
way to convert the kword and kspread xml formats to html.)

-cjr