![]() 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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