: Many updated CodeBreaker saves are large. If the emulator says there isn't enough memory to save, you might need to use a larger virtual memory card (e.g., 64MB). Region Matching
The file is a virtual memory card used by the PCSX2 emulator to store and update cheat databases for the Codebreaker software. While Codebreaker was originally a physical disc for the PS2, modern emulation allows for updated "Day 1" cheat lists to be sideloaded via these memory card files. Download and Implementation : Many updated CodeBreaker saves are large
: You need a version of the CodeBreaker software (like v10 or v10.1) as a disc image to launch the cheat interface. Mcd001.ps2 : Many updated CodeBreaker saves are large