set default editor

So I did a quick search on this and didn't find the answer I was looking for. So I work for a company that uses velocity templates. That's fine and all but the way they have it set up is the template does not have an extension on the file, which typically would be .vm. So instead of myfile.vm we just have myfile. So there is a plugin for velocity editing which I have downloaded. I've been checking through the help facilities and there are great directions for making associations with extensions and certain editors but I could find where you define a default editor. I did figure out one way to get the velocity editor to come up and that was with using the open with option from the context menu. Just double clicking the file icon opens up a plain text editor with no syntax highlighting. I would like that plain text editor to be the velocity template editor.