Short and sweet, as I had someone ask me about this today...
The \windows\system32\ directory on 64 bit version of Windows does not contain 32 bit files it contains 64 bit files. The 32 bit files are stored in \windows\SysWOW64
WOW stands for "Windows on Windows"
Go figure, the 32 bit files are in a directory with 64 in it, and the 64 bit files are in a directory with 32 in it.
According to the road map the next version of Delphi should be able to produce 64bit applications so it's important to know this detail.