I wrote last year that I thought someone here had developed a djvu
plugin that we hadn't released because it relied on proprietary software.
It turns out the plugin actually was developed to process metadata files
in Internet Archive format, and as part of that, tries to extract text
from djvu files using a linux utility djvutxt (comes with reference
implementation of djvu viewer??)
So unfortunately we don't have a djvu plugin.
If someone here gets time, we can have a look at it and see if it can
make it into a general djvu plugin.
But we are quite busy at the moment, and this will not be high on our
In the meantime, please use UnknownPlug as has been described on the
list. Or if someone would like to write a djvu plugin and send it to us,
we'd be happy to include it in a future release.