CorelDRAW Ideas Portal
Corel Connect does not show enough formats with preview.
EPS, SVG, CGM are missing, even Corel's own CMX is not displayed.
A list view should be available.
It is not possible to access mapped UNC paths (Z: \network\folder}...).
Some of the inherent limitations in being able to show file previews belong to Windows rather than the host application (with the exception of CMX, I think, if the preview handlers installed right). I imagine there are ways around it that don't involve having to process every file the host applicaiton can handle, writing a preview image and holding it either in memory or on disk but no matter how you did it if you opened a very large cache of images it'd have to thumbnail you're looking at a bottleneck, especially with something like Connect that's going to be intertwined with/parasitic to the host process. A fully external media/sorter/whatever application would be better in all cases, as others have suggested.
Corel ignored Corel CONNECT few version ago.