ye the x-box can run linux, but look at processor specs, or more to the point processor spec differences of the best of the best mobiles, not going to happen, you may be able to get some real cruddy old dos app to run an exe file. but id bet a pound to a penny that there is allready a java app that covers any functions you could get from running an exe.
my 2p worth.
regards
t.aziz