Photoshop PSD thumbnails used not to show in Windows Explorer without using Sagethumbs, but recently, having reinstalled Sagethumbs, when I lost the thumbnails again, after a Windows 10 ‘upgrade’ several months ago the ‘holder’ for PSD images in Explorer shows neither the Photoshop logo nor the thumbnail but is simply blank. FastPictureViewerCodecPack didn’t restore them either.
I had hoped that the most recent (Windows 10 Pro Version 1803) upgrade might fix the problem but it didn’t. I can see the thumbnails in Fastone Image Viewer (excellent software) and I simply don’t understand why Windows hasn’t fixed this problem. Searching Google merely finds more people like me.