I thought that I posted this a few days ago, but cannot find the post anywhere.
I am running version 9.1, and in the Preferences/Plugins/Viewers, and click the Configure button for the MultiView plugin, it says the 'Viewer DLLs could not be located'. When I click the Locate button, and navigate to the Opus 'Viewers' folder and select it, the 'OK' button is still disabled. The DLL 'is' there, but I cannot click the Ok button!
I cannot find anything about this in the Help file.
It's not the Opus viewer DLLs that you have to locate (Opus already knows where they are ) but the QuickView DLLs which come with some other programs, such as Yahoo Desktop (which is free) and X10.
The MultiView plugin acts as a bridge between those viewers and Opus so that if you have them installed you can use them in Opus as well.
There's a thread links from the topic about the MultiView plugin in the Plugins forum which explains how to get the DLLs via Yahoo Desktop.