MHT Files Viewer provides a way to view MHT files in Android
Enables the user to open MHT files from their Email Client or File Browser

MHT files are packed files of HTML content
The app Unpacks the content to display it

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The issue with the app being offered as an option for many file types is a known issue
It would not have been possible to offer it to MHT extension otherwise
Sorry for the inconvenience