It holds the "Day 1" game list and any custom codes you’ve added.

Make sure you have a legitimate copy of the game you're interested in.

[Current Date] Prepared For: PCSX2 End-User / Emulation Enthusiast Subject: Feasibility and Method for Downloading an Updated Codebreaker Cheat List (mcd001.ps2)

folder that the emulator applies automatically, bypassing the need for a separate Codebreaker ISO and memory card file. Sites like GameHacking.org allow you to download these pre-formatted for PCSX2. direct download link

This is the critical step that most guides miss.