they did. early DP builds would but they decided not to.
windows 7 x64 pro runs, but does not boot the install DVD as is.
Early 2008 3, 1 has preliminary first EFI64 that does not support UEFI required for Windows 8
you have 32-bit EFI 1.1 and no work was done on it since 2007when EFI 2.X UEFI standards was begun. some things cwn be oatched in various ways and even all the code compilers used now are pure 64-bit, so no 32-bit driver, ever the PCIE 1.1 is going to be an ussue and bug.
TurboTax 2012 dropped support for 32-bit, for 10.6.8, for 32-bit processors.
Long overdue seeing it took so long to transition to a 64-bit only architecture and kernel.
for a hobby there is probably some learning value to play with a bootstrap loader.