I downloaded some PDF files from
this page.
I can open/read them using Acrobat Reader, but Calibre refuses to identify them as PDF files (the format field remains empty) and displays an error message
... n'a pas de format disponible when I try to visualize any of them.
I've never had this kind of problem before, though I'm used to read quite many PDF files in Calibre. Any idea how I can solve this problem?
Thanks for helping.