The text file naming scheme is emphatically NOT required; it only a convenience. You can (as I do) simply sort authors by using folders and have the name of the file be the title.
eg: \Classical\Charles Dickens\Tale of Two Cities.txt
PDF reads Author/Title from the metadata (unless the metadata is empty, in which case it uses the filename). I'm not 100% sure on FB2, since I don't use it, but I think it is the same, from metadata.
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