BIOS files are often zipped. Use a tool like 7-Zip or WinRAR to extract the .bin or .rom file.
has become the primary community-driven repository for preserving them. You can find comprehensive collections, often labeled as "Redump" or "BIOS Packs," at the following locations: PlayStation JP/US/EU BIOS Collection : A common landing page for the standard regional files ( for Japan, and The Comprehensive BIOS Archive ps1 bios archiveorg link
Here are the :
: Move the files into the bios folder of your preferred emulator (like DuckStation , RetroArch , or ePSXe ). BIOS files are often zipped
These archives contain the system firmware required by emulators like DuckStation and RetroArch to mimic original hardware functions. Recommended BIOS Files ps1 bios archiveorg link