Cannot open XML files processed with QDomDocument using Microsoft Word

[Bodizo]

After processing XML files with QDomDocument and saving them like this:

if(fileName!=""){
            QFile file(fileName);
            if(!file.open(QIODevice::WriteOnly)){
                QMessageBox::critical(this,tr("Error"),tr("Could not open file"));
            }else{
                QTextStream stream(&file);
                QString fdt=FDTemplate->toString();
                fdt.toStdString();
                stream<<fdt;
                stream.flush();
                file.close();
            }

if(fileName!=""){
            QFile file(fileName);
            if(!file.open(QIODevice::WriteOnly)){
                QMessageBox::critical(this,tr("Error"),tr("Could not open file"));
            }else{
                QTextStream stream(&file);
                QString fdt=FDTemplate->toString();
                fdt.toStdString();
                stream<<fdt;
                stream.flush();
                file.close();
            }

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the files cannot be opened using Word or FrameMaker. Frame maker error is "Invalid byte"(funky signs)" of a -byte sequence". Does anyone know
what is going on? The files look fine when i open them with NotePad and NotePad++...

I read somewhere that this might be casued by QString and I've tried to convert it to std::string using .toStdString() before sending to QTextStream, but that did no help.