I answer to myself. I understood my error : first of all, we have to save the file in the .rtf format ! Then, from the rtf file, we can generate the file in the .doc format.
I am sorry for my question. Thanks Laurent ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.