Sorry, I confused you. You have to open the .iso (The file on the disk when you play ACCF) and extract files called .brres. That's fancy hacker talk for graphics!
![Big Grin](images/smilies/bighappy.gif)
The RVFOREST.dat is used for save editing. You will need to be able to run back up of games in order to hack the textures/Graphics, which you can't talk about here :P You can use google, or look it up on GBATEMP though.