Like I said, full blown FPC 64-bit environment only includes 64-bit executables, namely the compiler, the text mode IDE, the GNU GDB debugger for Win64, all RTL and package units compiled for 64-bit environment and few utilities (some are 32-bit, thought).
You need to check yourself if that cross-compiler package suits for you. I myself build my own FPC environments, currently 2.6.4 (release) , 2.6.5 (fixes) and 3.1.1 (development version from SVN trunk).