Hi,
Yes I tried the epub conversion, but not the Action Chain or Editor Chain. In the first case it did not do anything, and in the latter cases, I had another idea before trying them.
I think I found one reason for the problem.
This is what I have when the files are 'corrupted', in my files explorer on my PC, where the library stands.
When I delete 'Alcools' from Calibre, the second folder with little epub file disappears, and also from the file explorer.
I then import the remaining 'Alcools' into Calibre, then transfer it to my Kobo. And I can read it !
What I did not see in my file explorer is that I had 2 versions of books, inside the author folders. And the corrupted ones in many cases where imported into the Calibre library.
So it seems that I have a lot of cleaning to do and create another library with the clean ebooks.
Do you think it can be done with a script (that I would not be able to do myself) ?