Microsoft's Xbox is emulated by xemu, available on PC (x86_64) only: emulating this console requires a recent x86 machine and a Vulkan- or OpenGL-capable graphics card.
Two files are mandatory, without them no game will start:
/recalbox/share/bios/xbox/
├── Complex_4627.bin
└── mcpx_1.0.bin
MD5 signatures are checked: a file with the right name but the wrong content will be flagged as invalid by the BIOS checker.
Games go into /recalbox/share/roms/xbox and must be in XISO format (.iso extension). A raw Xbox disc image, as obtained by copying a DVD, is not directly readable: it contains padding data that must be stripped. See Converting games.
xemu emulates the console's internal hard drive. On the first game, Recalbox automatically creates:
/recalbox/share/saves/xbox/
├── xbox_hdd.qcow2 (the virtual hard drive — your saves)
└── xemu_eeprom.bin (the EEPROM — the console settings)
Back this folder up: this is where all your progress lives.