this might not be ata ll a fault of dopus, but i thought i would ask here, since people are generally helpful and knowledgable--
i can't seem to get djvu files to properly associate with djviewer. in dopus i double-click the file and it always opens the 'open with' dialog, regardless of whether or not i click the 'always use this program' checkbox. then i noticed in djviewer it gives the error: "may not have enough permissions to write to the system registry" when i try to manually associate djvu files with it. any ideas on what to try? i am floundering.
Run djviewer as Administrator (via UAC if you're on Vista/7) and then tell it to set up its association, then exit it. You should then be able to run it normally and have it work.