Do not rename other files (like BIOS files) to mcpx-1.0.bin . They are different sizes and structures.
It is important to remember that mcpx-1.0.bin is copyrighted code owned by Microsoft. Because it is a proprietary piece of firmware, it is not bundled with xemu. xemu mcpx-1.0.bin
The short answer is .
Think of it like a car: The mcpx-1.0.bin is the ignition key and starter motor. The Complex_4627.bin is the engine control unit. You need both to drive, but the starter must work first. Do not rename other files (like BIOS files) to mcpx-1