Wouldn't know but I'm curious as to what editor that is.
It is renpy's own, gotten on their homepage
You must be registered to see the links
.
Once it is downloaded, you open it up and press on "options.rpy" in the menu under "Edit File", then you can select the file you want to look at.
I really reccomend having some sort of editor for this game, it helps with finding out requirements for certain events, fiddling with them, changing things etc.
I could change my max stamina, the chances of the husband showing up at the fuck date, and find out what Vren plans to do with some characters further down the line.