Create new custom property handle "thumbnail"

[nightslayer23]

I had a thought.. would there be a way to create a new custom property handle in explorer but for thumbnails?

[RTT]

The tools already provide a thumbnail handler for PDFs, so I suppose you are referring to something else. But I'm clueless about what!
Please give me more details about the functionality you are proposing.

[nightslayer23]

eh - never mind. they'd likely be too small in details view anyway

[RTT]

Now I get it. Show the thumbnail in a details view column. That's, afaik, not supported by the shell. It can show icons (pre-registered as an enumerated values property, drawn as IconList), as the OneDrive property handler does for the status column, but not thumbnails.
And yes, if supported, it would have the same size of the icon in the file name column.