Well they shot themselves there. The CLR was supposed to be the portability layer i.e. IL code would be dynamically compiled. Unfortunately due to Microsoft's s

Well they shot themselves there. The CLR was supposed to be the portability layer i.e. IL code would be dynamically compiled. Unfortunately due to Microsoft's schizophrenia, it never became a first class part of the OS over say non-portable PE x86 specific binaries. Technically they could use dynamic translation, but building a working translator for x86->arm would be an absolute bastard as x86 is such a non-orthagonal mess of an architecture.