Hi
Well I see there is a new version of Windows 10 available now to early adopters so I'll wait until that's done before I start messing around with this.
It's not that big a deal, just inconvenient, being able to see the thumbnails is the main thing.
I use a program named Sage Thumbs to make the .Psd files show in Windows File Explorer, I've used it for a long time. It makes Windows show thumbnails for several formats that it can't show on it's own. I've just run across a post saying not to install Sage Thumbs because it causes problems in Windows 10, pretty sure I've used it ever since Windows 10 went in to beta, but I'll watch for issues, I'm not seeing any of the thinks mentioned in the post.
Mike