Xemu does not have a "ROMs" folder by default. You must create one or specify the path manually.
is the most common version, found in the vast majority of Xbox consoles. xemu mcpx-1.0.bin
The code inside mcpx-1.0.bin is the intellectual property of Microsoft Corporation. It is open source, freeware, or abandonware. Distributing this file without authorization is copyright infringement. Xemu does not have a "ROMs" folder by default