These temporary files are terrible! I don't know which major Windows version started with the ".thumb" and "desktop.ini" files, but if I tell my OS to navigate and display me contents of a folder, please don't change anything in that folder! You should be assuming "read-only" as often as possible, and only assume anything else when explicitly stated to do so.

But instead, they create thumbnails. In the very same source folder. Shouldn't this stuff go on some cache in your windows directory?