If the editor requires it, use PS2 Save Builder to extract the individual BASLUS files from the save archive.
To edit a PS2 save file on a modern PC, you need a specific toolchain. The days of Action Replay discs and physical USB dongles are mostly gone; today, we use software solutions. Dragon Quest 8 Ps2 Save Editor
A memory card manager for the PCSX2 emulator, essential for exporting save files from a virtual memory card to your computer for editing. If the editor requires it, use PS2 Save