I'm wondering if you can populate the library with content progressively.
A Calibre book folder does not have to contain a format file; some users use this feature as a means of recording 'books to get', or recording their paper books.
Perhaps you could create a viable (albeit empty) library of 300,000 articles from the text file you mention, which I assume is an index that includes a reference to the archive in which each article is located.
Maybe that reference could be 'munged' into a file uri (file:\\\thearchives\archive_002.zip) and popped to a custom comments-like column that you display in the Book Details area (normally to the right of the 'book' list). Then you could click on it to open the archive as required. Most (all ?) archive utilities will let you open an archive member from within an archive - they extract it to a temporary folder and hand that file off the relevant program.
And of course you could drag the article (text file, fb2, cover) content out of the archive and drop onto the Book details (probably indirectly - archive->scratchpad->calibre)
You might be able to create that initial database using the Import List Plugin.
BR
Last edited by BetterRed; 05-11-2014 at 06:54 PM.
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