Games in ZSO format do not need to be extracted before playing; homebrew tools like Open PS2 Loader (OPL) or ARK-4 for PSP can read them directly. Popular ISO to ZSO Converters
Uses the LZO algorithm, which is faster than the Deflate algorithm used in CSOs. iso to zso converter
This is a command-line tool, meaning there is no graphical interface (buttons/windows) by default. We will use the Command Prompt. Games in ZSO format do not need to