The utility will copy several files (typically including .bin , .rom1 , .rom2 , .erom , and .nvm ) to your USB drive.
To obtain a for use with emulators like PCSX2, you must legally dump it from your own hardware. Distributing or downloading BIOS files from the internet is illegal because the software is copyrighted by Sony. Legal Method: Dumping Your Own BIOS Ps2 Bios Japan Scph-90000 Download