Depending on where the archive is acquired, the file might download under variants like complex_4627.bin or inside a compressed .rar archive. Ensure it is fully unpacked and renamed cleanly to complex_4627v1.03.bin (or complex_4627v1.0.bin based on what your emulator's directory setup expects).
The "4627" portion of the name references an official retail kernel version released by Microsoft for the Xbox 1.0 console revision. Complex-4627v1.03.bin
+---------------------------------------------------------+ | xemu / xQEMU Emulator | +---------------------------------------------------------+ | | v v [ mcpx_1.0.bin ] [ Complex-4627v1.03.bin ] (Initial Boot ROM) (Modified Kernel / Security Bypass) \ / \ / v v +---------------------------------------------+ | Bypasses Signature Checks & Boots Xbox Game | +---------------------------------------------+ Depending on where the archive is acquired, the