I'm very interested on extracting those graphics. Could you elaborate more, please?
To extract graphics, you have to use the DDDA Tool and ARCTool. Grab them here: http://residentevilmodding.boards.net/thread/5740/ddda-extractor-repacker-image-viewer
This will allow you to view and extract the images and convert them to tex files, which in turn can be converted to dds files.
There are a few flaws with this software however. While trying to extract the .arc files, if the software spits an error out about inaccessible file, it will freeze. So if you try extracting on a folder with a ton of .arc files, and the tool finds one file it doesn't like, it will stop. So it is a pain to work with. Furthermore, only graphics can be extracted. I've not had luck extracting anything else with the tool. So unless someone who is a lot smarter than me can make a MMXC extractor, results will be limited.
Also, images can only be converted one at a time...so, have fun. You may have luck with the batch arc extract, as it will extract and convert. But I always get an error when doing this.
Also, sorry everyone, the ps1-era games appear to be the PC versions. And they are split up into approximately 1 billion arc files.