Concerning following plugin from Leo's website
https://www.pretentiousname.com/opus_plugin_list/index.html
looks like
https://www.ardfry.com/psd-codec/ is not available. Is there any mirror of the plugin?
I've sent you a private message with the installers I had saved, but I'm not sure if they will work.
Thanks Leo. Well, they indeed didn't work. I get the 15 days trial message, and i will only get some sort of text in the viewer pane. I guess, that could be due to the 32/64 bit thing. I'm usinf a 64 bit Windows 10 here. But it was worth a try anyway.
If you have Adobe Reader installed, you might be able to add .ai to its preview handler. I'm not sure if it works though.
Thanks, qiuqiu, but that didn't work either for .ai Adobe Illustrator file. I only get the raw text in the viewer. Maybe i will give Leo's tip a try now.
In case it would, could Opus view it then? It's not a big deal to have a preview for .ai, but would be a "nice to have".
AI, PS, EPS, PDF Support
To enable thumbnails for Adobe Illustrator (ai), Postscript (ps, eps) and Adobe Acrobat (pdf) files you need installed old Ghostscript library:
Hmm, still no preview. But maybe i have to have Illustrator installed in order to make it work? I'm only trying to preview .ai files.
I do not know if this helps, but if you install Mystic Thumbs and set it up to produce ai thumbs, you will get thumbnails of Adobe Illustrator files. If you double click on them in Opus they open in Mystic Thumbs viewer.
Mystic thumbs installs Ghostscript, which is needed for viewing Postscript files.
I am sure there are other thumbnail programs that will do the job.
If you're aiming to use a Thumbnailer designed for File Explorer, to get previews in the viewer pane (not just for thumbnails), make sure you have this turned on:
- Preferences / Viewer / Viewer Pane / Display shell thumbnails
Also note that it'll only work in the viewer pane, not in the standalone viewer.
This doesn't apply to Preview Handlers (which are specifically designed to be used as viewers in File Explorer, Outlook, Opus etc.), only Thumbnailers (which return a bitmap of a file). Thumbnailers often make good-enough viewers, but the option needs to be on for the viewer pane to use them.
Thanks for the tip Leo. PC support for Postscript has always been woeful, and it does not seem to get much better. If i need graphics, I always find it is best to turn them into PDFs - unless you particularly need the vector properties for lossless scaling, of course.
Adding .ai to the preview handler you're using for PDF may also work. (It depends whether the preview handler will try to open anything you ask it to, or if it checks the file extension is really .pdf.)
You can do that via Preferences / Viewer / Plugins and configuring the ActiveX + Preview + Office + Web plugin to add the extension to the preview handler you're using (e.g. Adobe Reader or PDF-XChange).
Interesting tip, but were can i find PDF in the preview handlers? If i click "configure", nothing happens for most plugins, i can't find it in the plugin manager either. Maybe there is none, since i only use Windows 10 native PDF viewer?
e/ and yes, that option is already turned on
Configure the ActiveX + Preview + Office + Web plugin for a list of preview handlers.
Microsoft's native PDF viewer doesn't include a preview handler, since Microsoft already forgot about and started neglecting the concept of viewers in File Explorer / Outlook / etc., due to being a company of absolute scatterbrains. 
But other PDF viewers do include them, such as Adobe Reader, Sumatra (if you select the option during installation) and PDF-XChange (and some others).
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Leo, it works now! I didn't even need to add anything to the config. Very nice. Though i didn't register the Adobe Reader as the main program, since the native viewer is light weight enough for everydays use.
Preview ok,Thumbnail not display.