Original OPL versions required FAT32, which mandated the use of USBUtil. However, modern OPL versions (such as OPL v1.2.0 and above) natively support exFAT , meaning you can drop full, unsplit ISOs directly onto your drive.

Click in the top menu bar and select Create GAME from ISO .

by automatically "slicing" large game ISO files into smaller parts cdn.prod.website-files.com Core Features & Functionality ISO Slicing (The "ul" Format)