On computers running Microsoft Windows, a thumbnail cache is used to store thumbnail images for Windows Explorer when thumbnail view is enabled. The hidden file thumbs.db is a database file containing a small JPEG representing each of the thumbnails in a folder. Thumbs.db files are.
Windows loves to create thumbs.db files, but they can cause problems, especially on a network. Here's what you can do about them.
You won't see any thumbs.db files unless you've checked "Show Hidden Files and Folders" in the Folder Options panel and are using the icon mode in Explorer .