One might expect a Windows clone to run software written for Windows -- or an AmigaOS clone to run software for ? (just a harmless stab)
Talking about OS clones, please try running apps for older commercial Unices on Linux, and they won't work: AROS aims to be source-level compatible with AmigaOS on different platforms, and binary-compatible on the same (68K) platforms, but since there is no AROS for 68K in a standalone shape, nobody can say exactly how the two are effectively compatible. Some parts of AROS are available for AmigaOS 3.x, though, to enhance it (look at bernd's AFA-OS), and they are ironed out to mantain compatibility with existing 68K software.
And, just to hit the nail on the coffin of this discussion, just try to port ReactOS on a PPC motherboard, and look if x86 binaries will run on it...
