This viewer enables you to view and extract thumbnail images that are stored inside the Thumbs.db files commonly found on many Windows.
The Thumbs.db file caches a thumbnail version of the pictures in the folder, making it quicker to view the thumbnail images each time the folder is opened.

This tool supports Thumbs.db, ehthumbs.db, ehthumbs_vista.db, Image.db database files found on Windows OS. 
You can open a Thumbs.db file to read from your computer or your Google Drive and download the extracted images as Zip file.

*What is a Thumbs.db?
Windows uses Thumbs.db as a cache to quickly display thumbnail previews of all images that are stored in a folder. This Viewer sometimes can be useful to find evidence of previously deleted or moved images.
Thumbs.db files are hidden system file and you need to configure Windows to show hidden files before you can see them.