I dunno if this has been mention, and I'm sorry if I have.
But I love JAV covers, so I was going nuts setting every folder to show the front of the cover in Window Explorer's thumbnail view...
Like this:
View attachment 2231778
I used to do via the folder properties and the customize menu. But it took forever to do, and worse yet, if you moved the folder around or even the subfolder it would break. It sometime wouldn't update either. It was really really awful, and just garbage Windows implementation as usual. And then I found this magical trick!
If you actually name the cover "Folder.gif", regardless of what image type it is, it's going to always use that picture as the folder thumbnail. It's some god damn ancient holdover, but it works! It really works!