Hello, I want to use a viewer to see the corel draw files, is there a free or paid plugin? Thank you
If Corel or a third party have made a Preview Handler and/or Thumbnail Provider which works in File Explorer then it should also work in Opus's viewer pane.
ActiveX controls can also be used, often made for Internet Explorer to view things, although they're less common now and often have problems with high DPI.
Opus also has a native plugin API/SDK but AFAIK no one has written a Corel plugin, unless one of the multi-format ones handles it.
(It's not something I use myself, so I don't know exactly what's out there.)