This specific file, , is a split archive part containing the comprehensive BIOS collection required for RetroBat 7.0.0 . Since RetroBat is an interface designed to configure EmulationStation and RetroArch on Windows, these BIOS files are essential for running hardware-specific games (like PS2, Saturn, or Dreamcast) that won't boot without original system firmware.
If you’ve downloaded only the .001 file, check if there are more numbered files ( .002 , .003 ). Assuming you have the complete set: Full.Bios.Retrobat.7.0.0-MS. 7z.001