If you are looking to import or export specific game saves from a virtual memory card, you can't just copy-paste individual files from Windows Explorer. You’ll need a tool like to open the memory card file and extract or inject specific game data.
PCSX2 memory card, use a program called MyMC. All you do is open mymc-gui.exe, open your memory card in it, then import your save, Memory Cards - PCSX2 pcsx2 save files location work
Within this directory, you'll find several important subfolders: If you are looking to import or export