Arthur, I'm buggered today. Not a rare occurrence, unfortunately.

Just a quick comment. Windows Explorer has always natively supported CanNikon raw files via its native codecs. Most of the rest of us have to purchase third party codecs to even see the embedded thumbnails in the raw files!

I cannot speak for Windows 10. I don't use it.

My point being that it is always tricky to generalize from support for CanNikon cameras to other, smaller brands.

I have located the Bridge database store in Windows 7. It has moved from where it was stored in XP. It is very imaginatively (for Adobe ... ) called "store".

The link to it is via an explicit pathname in Bridge/Edit/Preferences/Cache. This allows the cache files to be moved and reattached to Bridge.

Bridge can be forced to rebuild the entire cache (thumbnails and metadata) either using Bridge or by simply deleting the contents of the cache folders and telling Bridge to rebuild the cache at either the existing location or a new one. Bridge extracts the data it needs from the image and XMP files.