Aethersx2 creates a virtual PlayStation 2 memory card file (usually formatted as a .ps2 or .mcd file, or as a folder of files called a "Folder Memory Card").
Saving/Loading | Resident Evil 4 Official Web Manual - CAPCOM
By default, AetherSX2 saves memory card data in the following folder on your Android device: save data resident evil 4 aethersx2
Use a PC memory card utility tool like to open your Aethersx2 Mcd001.ps2 file.
These act exactly like the physical PlayStation 2 memory cards. When you visit a typewriter in Resident Evil 4 , the game writes data to a virtual .ps2 or .mcd file. Aethersx2 creates a virtual PlayStation 2 memory card
If Aethersx2 updates, older save states may become incompatible.
⚠️ Works only with version of the game. Backup your existing memory card first if needed. When you visit a typewriter in Resident Evil
Recommended best practices
If Resident Evil 4 freezes while loading an in-game save, try changing the Graphics Backend
These act exactly like a physical PS2 memory card. When you visit a typewriter in Resident Evil 4 and save your progress, the emulator writes that data to a virtual memory card file ( .ps2 or folder-based).