How to add a program to a list with right click button?

Question

When I right click on a file, a list of menu pops up. And, it has vim or emEditor for me to edit the file that I right clicked. I need to add emacs to that menu. How can I do that?

Answer 1

Look at Add Your Own Program to the Windows Explorer Right Click Context Menu.
There is also an older GVim wiki note describing this (it states the correct caveats on registry edits).

Answer 2

One method is using the registry, another method is using an application that edits the registry for you.