On [[Microsoft Windows]] [[operating system]]s, starting with the IE4[[Internet Explorer 4]] Active Desktop Update for Win95/98,<ref name=PCWorld>{{cite web |url=http://www.pcworld.com/article/13357/windows_tips.html|title=Windows Tips|date=19 October 1999|work=PCWorld}}</ref><ref name=AccessData>[http://accessdata.com/media/en_us/print/papers/wp.Thumbs_DB_Files.en_us.pdf Thumbs.db files forensic issues: AccessData Corporation]</ref> a '''thumbnail cache''' is used to store [[thumbnail]] images for [[Windows Explorer]]'s thumbnail view. This speeds up the display of images as these smaller images do not need to be recalculated every time the user views the folder.