GoldenLion

Sorry to ask this here, but how are arc files supposed to be repacked? Everytime I modify a texture and then repack it the game crashes

I tried to add a new song and everything worked fine except when I tried to add the thumbnail jacket. I unpacked the arc file, added the jacket and then repacked the arc file but when I boot the game this shows up in the console Did I do something wrong or does Omnimix have some kind of modification?