I hate to be this guy, but - as neat as this solution is - can we please stop saying 'x64'? Intel 64, amd64 or x86_64 are fine, but x64 just sounds so wrong. It seems completely ignorant of why the architecture is called x86 to begin with.
It's short, and the "why" behind names doesn't matter.
Its also ambiguous there are about 5 different, relatively popular "x64" architectures.
It's fine, it's a harmless abbreviation. Yes, we know, x86 means "ends in 86", but it doesn't matter.
x86 is inaccurate anyway, since people actually mean >= Pentium.