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A Zip format essentially allows either extremely large files or files created in formats no longer widely used to be combined and compressed and thus downloaded with more speed and ease. The user requires an "unzip" utility to extract files from an archive. (All files for downloading have been compressed using Zip archiving and compression.) NCES uses Zip archiving for many of its databases and older publications. In addition, some older reports are available only in a combination of file formats, such as Lotus .WK1 format for tables and plain ASCII for the text.