You're referring to the Pnach file for Resident Evil Code: Veronica X!
2. Where to put the file
Navigate to your PCSX2 folder > cheats folder. Place the .pnach file here.
Run the game in PCSX2 and look at the log window. You’ll see a code like (this varies by region). Create the File: Create a new Notepad document and rename it to [YOUR_CRC_CODE].pnach Add Your Codes:
You can create a text file, paste the following codes, and save it with the appropriate .pnach extension. For NTSC-U (24036809.pnach):
Place the File: Move the .pnach file into the Cheats folder within your PCSX2 directory.