Potential for Breaking into DS Roms?

[Ion Dune]

I remember that a while ago, I used some tools to open and decrypt files from a gamecube rom, so that I could open the models and look at textures. Is that at all possible with DS? If so, where can I get tools for doing so?

[Ion Dune]

Update: I used dslazy to open it up, but now I can't seem to find a way to open the .arc and .nsbtx files found inside. Any ideas?

[acevampire]

Same here, I would like to know HOW to open such files.