first thanks for answering, are conversations that clear at the time (for over a year), retrieve them with an external program to whatsapp (do not know if you can put links or say name of the application) and I have and I get to see them on the PC, but the problem I have when I return to restore to Whatsapp, not how to do it with the file extensions that name in the first post ...
Thanks again. Greetings.