I've read other discussions of the viewer problem, but mine seems a bit different, and the new viewer doesn't solve it, hence this new topic.
Since I've installed 9.1 the Opus viewer doesn't properly display word processing files: DOC, RTF or WPF. If the "text" plugin is selected, these files display as if they were opened in Notepad -- that is, what I understand to be hexadecimal. If I deselect the "text" plugin then the text viewer doesn't handle them at all, and displays the message "...doc (or .wpd) is invalid or not a recognized picture format."
From other posts, I gather the problem has to do with the multiview plugin. (It was selected throughout the testing I described above.) By opening the "configuration" module to multiview I discovered that Opus is looking to my X1 folder structure, the Stellent\filters subfolder. But I noticed that Opus also has a "multiview.dll" in its \viewers folder. So thinking that the X1 DLL might be the problem, I uninstalled X1, and made sure to delete the folder structure.
But now, when I go into the Multiview configuration module, Opus is still looking to the X1\Stellent\filters folder. And there is a message: "Viewer DLLs could not be located." So I click the "locate" button. I'm able to navigate through my folder tree OK to the Opus\viewers folder, but when it is selected, the "OK" button is grayed out. Opus refuses to accept that folder.
I noted that GP in the last few days released a repaired "multiview.dll." I downloaded and installed it. But that doesn't help. Of course, Opus evidently refuses to recognize it.
I tried copying multiview.dll to the the main "Directory Opus" folder, on the chance there was a problem with the "viewers" folder, but same problem: The OK button remains grayed out.
And I just now downloaded and installed Opus 184.108.40.206.2893 x86. Didn't help.
(I've been running Opus for several years, and recently upgraded to 9.1 from 9.0. I have a Dell Dimension 4100, 1.7 MHz, 512MB RAM, plenty of disk space, WinXP SP2 kept upgraded.)