This is not true. Did you read the answers? 32-bit OSs with PAE support can use all the RAM. Most processes will only be able to use 4GB, but that's per process, not for the whole system.
So AD1066 doesn't need a 64-bit Windows, just any 32-bit Windows newer than XP.
> So AD1066 doesn't need a 64-bit Windows, just any 32-bit Windows newer than XP.
No. Non-server 32b Windows will never give access to more than 4GB RAM to the user unless you patch the kernel. XP 32b, Vista 32b and 7 32b — including Ultimate for the latter 2 — all restrict "available physical memory" to 4GB in all situations. So do many server editions as well, for Windows Server 2008 x86 for instance, only the Enterprise and Datacenter editions will give access to more than 4GB RAM (up to 64).
A 2008 Enterprise license is ~$1500. I doubt ad1066 has any desire to pay such a price.
So AD1066 doesn't need a 64-bit Windows, just any 32-bit Windows newer than XP.