AngelScript should work just fine on WinXP 64, though without support for native calling conventions, i.e. you'll have to use the generic calling convention (see asIScriptGeneric).

So far, the only 64 bit platform that has full support for native calling conventions is the PS3. This was recently sent to me by midnite, and added to the version in the SVN.

I don't have access to any 64 bit platform myself anymore. I had access to Linux before, but with the SF.net compile farm gone, that's no longer possible. This makes it quite difficult for me to add the support for native calling conventions myself.

If you feel up to it, you can add it yourself to AngelScript. It doesn't require a lot of work, really. It's mostly a matter of implementing some simple assembler routines to pass the arguments from AngelScript to the C++ stack space in the convention expected by the C++ functions. You'll only have to work with two files in the library to do it, the as_config.h file for compiler configurations, and one of the as_callfunc_??.cpp files for the platform specific assembler code.

Regards,
Andreas