I send an email with an attachment. Having attached this file, I see it at the right side of the title. When I double click on it in order to verify that it is the good file, I see the following (in French)
mnt/DATA/JF/Documents/carrelageSDB.pdf n’a pu être ouvert car l’application auxiliaire associée n’existe pas. Changez cette association dans vos préférences.
What have I to do ?