Web page archive saved with Internet Explorer; formatted using MIME HTML or "MHTML," which saves HTML, images and other media files into a single file; encoded with .MIME encoding.
Most Web pages viewed in a Web browser only contain HTML and reference images and other media files that are stored in other directories on the server. Because all the files are encoded into a single file in a MHTML document, MHT files are commonly used to archive Web pages.
NOTE: Microsoft Word can save and open MHTML Web archives.