Hi,
this is rather an information than a problem posting.
Yesterday I was looking for a way to open djvu files.
I like to keep my system tight, in a sense that I don't want to add packages before I know what is supposed to be used for.
Apparently ePDFViewer can't open them, no matter that if you've already installed djvulibre.
So the solution is to use Evince and djvulibre package.
That's it.
I went to the IRC channel and somebody there ask me to test out myself, so this is what I come up with.