[tripwire]

I want to try editing some textures and data in PSP games but can't find any programs that can open ARC files. Does anyone have a possible solution for me?  I've followed many dead-end Google and YouTube links.  Also any programs for editing other files inside the ISO/CSO images.

[Jorpho]

As suggested by https://gbatemp.net/threads/is-there-a-way-to-unpack-repack-edit-arc-files.382894/ , ".arc" is probably just a file extension and not a universal file format.

Perhaps you could say what game you are looking at and what you have tried so far?