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An ABI for amd64 was consciously developed independently by the gcc developers and Microsoft. Microsoft did "the obvious thing" and extended __fastcall to define their ABI.

Here are links about this topic:

> http://stackoverflow.com/a/35619528/497193

> http://stackoverflow.com/a/4438515/497193

> http://stackoverflow.com/a/35621290/497193

I already have 32-bit and 64-bit copies of all the libraries on my computer. I'm really not looking forward to having a third copy lying around.

There are some ugly hacks[0] to run 64 bit code in a 32 bit process on windows by using retf switch to 64 bit code segment with one of the major limitations being you can't load 64 dlls into the process.

[0]: http://blog.rewolf.pl/blog/?p=102