XP kept a hidden thumbs.db file in each folder that had images.
Vista and newer centralized LOCAL thumbnails to %userprofile%\AppData\Local\Microsoft\Windows\Explorer.
For network shares, a thumbs.db file is still created (and shared by all users).
https://www.ghacks.net/2014/03/12/thumbnail-cache-files-windows/
Tags: winxp, image, pictures