Windows XP Media Center Edition also creates ehthumbs.db which holds previews of video files. The file is created locally among the images, however, preventing system wide use of the data and creating additional data load on removable devices. Thumbs.db files are stored in each directory that contains thumbnails on Windows systems.
Under Windows 2000, Windows Me, and Windows XP, a context menu command to force refreshing the thumbnail is available by right clicking the image in Thumbnail view of Windows Explorer. In Windows XP only, from Windows Explorer Tools Menu, Folder Options, by checking "Do not cache thumbnails" on the View tab. From Windows XP, thumbnail caching, and thus creation of Thumbs.db, can optionally be turned off.
A separate Thumbs.db file was created if Windows 2000 was installed on a FAT32 volume. Thumbnail caching was introduced in Windows 2000 wherein the thumbnails were stored in the image file's alternate data stream if the operating system was installed on a drive with the NTFS file system. This effect is more clearly seen when accessing a DVD containing thousands of photos without the thumbs.db file and setting the view to show thumbnails next to the filenames. Its purpose is to prevent intensive disk I/O, CPU processing, and load times when a folder that contains a large number of files is set to display each file as a thumbnail.
Windows stores thumbnails of graphics files, and certain document and movie files, in the Thumbnail Cache file, including the following formats: JPEG, BMP, GIF, PNG, TIFF, AVI, PDF, PPTX, DOCX, HTML, and many others.
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