820 MHTML Aggregate AKA MIME Encapsulation of Aggregate Documents, such as HTML. This entry was previously named 'Microsoft Web Archive', however MHTML is not specific to Microsoft. MHTML is described by the IETF standard RFC2557. Text 220 The Church of Jesus Christ of Latter-Day Saints / The Church of Jesus Christ of Latter-Day Saints 10 Jul 2007 26 Sep 2020 multipart/related MIME x-fmt/429 PUID mht File extension mhtml File extension 1774 MHT BOF offset up to 2048 (may need to be larger): MIME-(V|v)ersion: 1.0 or Mime-(V|v)ersion: 1.0 {1-2} Content-Type: multipart/related 1 Absolute from BOF 0 2048 4D(494D45|696D65)2D(56|76)657273696F6E3A20312E30{1-2}436F6E74656E742D547970653A206D756C7469706172742F72656C61746564 Has priority over 641 Hypertext Markup Language Has priority over 642 Hypertext Markup Language Has priority over 1018 Internet Message Format Has priority over 1258 Hypertext Markup Language