Thumb.db is a cache of the current picture in any directory that contains Picture files for example: .jpeg. To remove it ,navigate to: 1> open "WINDOWS EXPLORER". 2>go to "TOOLS". 3>open "FOLDER OPTIONS". 4>go to "VIEW". 5>see 1st section "FILES & FOLDERS". 6>click on the "DO NOT CACHE THUMBNAILS". Now the thumbnail file will be removed from your computer once u do this the file will be never created.
