[Kelzan]

I have a question regarding the associated data files stored in the "data" directory for a book entry. I have a Calibre library where I keep my sheet music and songbooks, mostly in PDF format. Some of the books are play-along music books that have mp3 music files that I store as associated data files for the book. On several of these, however, I'm wanting to go in and add better tagging to the MP3's, and even rename the files.

Is this going to mess things up in the library if I rename files that have already been added as data files? Is the data file information stored explicitly when adding to the data directory, or does Calibre simply treat anything it finds in the data directory as a data file associated with that particular book entry? I always use the Calibre interface when adding data files to an entry, but if I were to simply copy something into the data file directly, would it be treated the same way?

On a similar note, does Calibre support subdirectories within the data directory? So far I've always kept things flat, and if I need multiple subdirectories I'll zip everything up into a single archive file, but it would be nice to leave it unzipped if subdirectories are handled correctly.

Thanks for any help or insight on this!