Filter Forge 2.0 is NOT 64 bit ? How could I install it outside x86 ?

I have Windows 7 64 bit and when installing Filter Forge 2.011 I have installed it in the C: root folder that belong to 64 bit applications so I thought that Filter Forge 2 was an 64 bit compatible software and was optimized to 64 bit.

Then when I installed FF 3.0 beta I was forced to install it in the Program Files x86 folder because it seems that it is a 32 bit application

So I thought that the FF 3.0 Beta was only made in 32 bit, and there would be a future 64 bit release when the FF 3.0 final version was released.

But the great surprise came when GMM wrote the following in another thread

Quote
GMM wrote: We don't have (and don't plan) a 64-bit version of Filter Forge. It can work as a plugin under a 64-bit host application but it still remains 32-bit.

I am sorry but I do not understand how could I install FF 2.0 in the 64 bit application side if it is NOT a 64 bit version, and then why FF 3.0 is not the same and needs to be in the 32 bit compatibility folder. I suppose that the FF 3.0 is because is still a beta and not the final version.

I must be missing something or having wrong knowledge about how the 64 bit application compatibility works or what can be installed outside of the Program Files x86 folder.

Please, could you explain more about this ?

SO, the FF 2.0 plugin can work under 64 bit host application but the FF 2.0 standalone version is 32 bit ?

Thanks very much

"Filter Forge is designed to never consume more than 1.5 GB of memory, so we don't need a separate 64-bit version of Filter Forge."

i've heard that before, gmm. why the limit there, especially since we now can have more effective ram in a machine?