MHTML document (Microsoft)
MHT is a Web page archive file format. The archived Web page is an MHTML (short for MIME HTML) document. MHTML saves the Web page content and incorporates external resources, such as images, applets, Flash animations and so on, into HTML documents.
In Internet Explorer, when you save a Web page as a Web archive, the page is saved as an MHT file. Any relative links in the HTML (those that don’t include all information about the location of the content but assume all content is in a directory on the host server) will be remapped so the content can be located.
MHT files open in Internet Explorer or, with an add-on, in Firefox and some other browsers. MHTML Converter is one program that converts MHTML files to regular HTML.
Because MHT files can be infected, they should always be scanned before opening.
MIME type: message/rfc822
Learn more about MHT files:
Wikipedia has an entry about MHTML.
Search for answers to MHT file-related questions on IT Knowledge Exchange.
MHTML Converter is available as a free download.