Hosting this file on a public blog or repository usually results in a DMCA takedown notice. Therefore, legitimate emulation guides will often tell you:
This tiny piece of code is a masterpiece of engineering. It handles the initial hardware initialization, performs a bizarre "memory size trick" to hide the top 64MB of RAM from the CPU initially, decrypts the kernel, and handovers execution to the Xbox OS. Without it, the hardware is effectively brain-dead. mcpx_1.0.bin file download
Because the mcpx_1.0.bin contains proprietary Microsoft code, it is copyrighted material. Emulator developers do not distribute this file directly. Hosting this file on a public blog or