I've been the current maintainer of Win32::API for some years now.
I am proud to be working on such a useful module, at least for Windows people. I even managed once to build it under Linux/winegcc.
Lately, I've been receiving user requests about porting it to 64-bit architectures. While this is something I want to do, I might have some problems. Mainly, my lack of knowledge about porting 32-bit stuff to 64-bits under Windows.
Luckily, there seems to be available information and enough interested users that can provide help, code, hardware and/or licenses.
So, if you are in any way interested in helping out or staying tuned on the 64-bit port of Win32::API, please join the libwin32 mailing list. I'm going to post some more details there.