In modern PCSX2:
This opens the exact folder in your OS file manager — no guesswork.
By default, PCSX2 stores save files in the "sstates" (for Save States) and "memcards" (for Memory Cards) folders inside your PCSX2 installation directory.
However, the location changes depending on your operating system and whether you selected "Portable Mode" during installation.
If you hate browsing file trees, PCSX2 has a built-in shortcut.
Step-by-step (Qt Interface):
Pro tip: This is the most reliable method, as it accounts for custom user-defined folders.
Once you open the memcards folder, you will see files with specific names. Understanding these solves 90% of save-related confusion.
File size insight: A standard PCSX2 memory card file is 8MB (8,192 KB) or 64MB. If your file is 0KB, it is corrupted.