Win64 binaries exist but require AES-NI. How do you know if you have it? If the binary crashes, you don't.
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Were you referring to that? Did you mean for that to be interpreted as "only a Win64 AES-NI binary is available" because when I first read it, it sounded like there was a non AES-NI build available somewhere. And you also mentioned some optimizations done to the legacy part as well so I'm a bit confused.