If you are looking to relive the glory days of the Xbox 360 era on your modern PC, you’ve likely come across Xenia. As the leading Xbox 360 emulator, Xenia has made incredible strides in playability, allowing gamers to experience classics like Halo 3, Red Dead Redemption, and Forza Motorsport 4 in high definition.
The primary settings file for graphics, input, and performance. Documents\Xenia portable.txt xenia bios files
Technically, no. You do not need to hunt down a specific bios.bin file to make Xenia run. The Backbone of Emulation: A Guide to Xenia
How to Use Xenia Bios Files
A BIOS (Basic Input/Output System) is essentially the low-level "soul" of a console that tells the hardware how to boot and interact with games. Download the latest Xenia from the official GitHub
Since you likely do not need a BIOS, here is the actual correct way to set up Xenia to play your legally backed-up games.
Where to Find Xenia Bios Files