Emulators do not come with the copyrighted BIOS files needed to run games because these files belong to Sony. While some emulators (like newer versions of PCSX2) can boot without a BIOS, using a real BIOS file provides several advantages:

For users looking to play European game releases, using a native EUR BIOS ensures proper 50Hz frame timing initialization and localized language support within game menus. Legal and Extraction Guidelines

Based on publicly available information, here's a summary of the SCPH-70004 BIOS V12 EUR 200.bin file:

Moving the resulting .bin file to the emulator’s designated BIOS folder on a PC or Steam Deck. Cybersecurity Risks