The MHT or MHTML format built under the MIME (Multipurpose Internet Mail Extensions) RFC 1521. The main idea of the MHT standard is that you send a HTML document, together with inline graphics, applets, etc., and also other linked documents if you so wish, in a MIME multipart/related body part. Links in the HTML to other included parts can be provided by CID (Content-ID) URLs or by any other kind of URI, and the linked body part is identified in its heading by either a Content-ID (linked to by CID URLs) or a Content-Location (linked to by any other kind of URL).