A file extension of MHT indicates that the file is a Microsoft archived web page file. MHT is an acronym for Multipurpose Internet Mail Extension HTML. MHT files can be created in web authoring tools, or in Microsoft Word by saving a document as an MHT web page. To change the MHT file extension to a PowerPoint Presentation (PPT) file type, you’ll need to convert the MHT file using the PowerPoint application and save it with the PPT file extension. Writer Bio
