Thanks @leonardder for cross checking it. I could not find a way to replace that file.
I agree that Edge is replacing IE11, but there would be a lot of users who would would still be using it. For example I don't use IE now, but vital source uses MSHTML control, and if I am reading a book in vital source I don't have a choice. I am also sure, many other software still use MSHTML control.
Yes, vital source would provide an option to read the book online, but that is not same as reading a book offline. I would request to make it p2.