MHT : Web archive - single file
When you save a Web page as "Web archive, single file (*.mht)" the web document gets saved in the Multipurpose Internet Mail Extension HTML (MHTML) format with a .mht file extension. All relative links in the Web page are remapped and the embedded content is included in the .mht file, rather than being saved in a separate folder (as the case is with "Web Page, complete (*.htm, *.html)").
MHTML enables you to send and receive Web pages and other HTML documents using e-mail programs such as Microsoft Outlook, and Microsoft Outlook Express; or even your custom Delphi email sending solutions. MHTML enables you to embed images directly into the body of your e-mail messages rather than attaching them to the message.