I've been looking for a Renpy extract tool for a while now. I stumbled across this via Ikaruga's DMD 0.10 mod, where he had linked to this tool.
I like how painless it is to use this tool. I simply placed the unren.bat in the game's root folder, clicked on the unren.bat, and I was off to the races!
I'm using Win 8.1 btw. Not sure how well this works for other OSes, but when I used it for DMD, it was a pretty hands off experience. Simply run this tool, following the instructions, and after a couple of minutes, voila! I had full access to the game content, scripts, etc.!
I chose option 4 btw. I like that Sam has provides us multiple, and clearly defined, options for the use of this tool
Very useful for those wanting to peruse the game art, or for those that like to poke under the hood.
Something that would make this tool even better would be to 'archive' the .rpa files in a separate 'backup' folder once they are extracted. Not a big deal to me, but others have suggested this as a way to 'declutter' the game folder.
Thanks for this tool!