MHT files are MIME encoded HTML (MHTML) typically found on Windows. MHT Files are also the way Internet Explorer saves web pages. MHT can end up on your Mac if you switch and bring your email with you, or if people use a misconfigured mail server. 
File Juicer can extract HTML and images from MHT files. You need only enable the email attachment in the preferences as MHT is uses an an email file format as encoding.
The only requirement is that they have the .mht extension so it can apply the stripping of the specially encoded characters in to convert it to HTML.
MHT Converter is an invaluable software to import MHT to Outlook 2016, 2013, 2010, etc. The tool assents to convert MHTML or MHT file to PDF, PST, MSG, EML, EMLX, MBOX, and HTML with file naming options. Click on the green Add File (s) button, located in the main toolbar to open the file finder window. Find and select the MHTML files on your computer and click Open to bring them into Doxillion to convert to them to the HTML file format. You can also drag and drop your MHTML files directly into the program to convert them as well.
Note
I recommend that you uncheck the duplicate removal in File Juicers preferences when juicing MHT files. It is common to reuse an image under different names in html. Removing duplicates can result in missing images in the HTML.
Links
- MHTML standard: Using HTML in E-mail
- Extract base 64 encoded mail with File Juicer
Mht To Html Mac Mht To Html For Mac Download
.mht free download - EZ Save MHT, Command Line URL To MHT Converter, Mht Browser, and many more programs. The content of an MHTML file is encoded as an HTML e-mail message using the MIME type multipart/related. By accessing your browser’s Tools menu, you can access the UnMHT sub menu and save the currently opened page or tabs as MHTML files to your Mac's hard drive for further viewing.