This is what Macromedia had to say about delivering x86_64 Flash readers, in case anyone cares:
Although we we've had a large number of requests it doesn't look as though we support it just yet. I touched base with the product team and this is what they came back with.... Macromedia is committed to the cross-platform compatibility of Flash Player, and adding support for new platforms is taken under careful consideration for every release. Because new platform support does require considerable engineering effort and cost to implement and support, the decision must be weighed against the other features considered for a release.
Writing code that is that unportable takes considerable effort... I learned my lesson writing 16-bit code for Windows 3.11 that broke under the Win32 model. You'd think everyone would have... I guess not. :-( -Philip