I know you are supposed to be able to build x64 apps in Delphi XE2...
I am using a paid version, the starter version.

I checked in options as well and it will not let me change to 64 bit. Only 32. I am also running XE2 from a 64 bit machine.
Could it be because I have the starter version? If so that is kind of ridiculous, see as I paid over $200 for this software.