If you have a save file that is already a full memory card image (a .ps2 file), the "PS2 BIOS Browser" method is a simple way to manage your saves. While it can copy individual saves, its main use is to verify that a memory card is working.
Most save files you download online (e.g., from GameFAQs) are not in the native .ps2 format that PCSX2 uses. They are often in proprietary formats created by old cheat devices. Here are the most common ones you'll encounter: If you have a save file that is