I thank Bruce Miller for his technical suggestions for solving the problem about the archives not being readable. In fact, contrary to what I had believed, there was something I could do via my blog's configuration options. I think I've got it right now, and I apologize for not having realized it before. It should work fine from now on. However, if an old archive file or link does not work, try to add the ".html" extension at the end (e.g., change http://perso.wanadoo.es/rgomezp/weblog/archive/2004_04_04_archive.#108127154749772465 to http://perso.wanadoo.es/rgomezp/weblog/archive/2004_04_04_archive.html#108127154749772465, or http://perso.wanadoo.es/rgomezp/weblog/archive/2004_02_22_archive to http://perso.wanadoo.es/rgomezp/weblog/archive/2004_02_22_archive.html). That should do the trick.
I really appreciate your comments and emails. They definitely make a difference and help me improve the service I am trying to offer. Thank you very much one and all!