Nikolay Sivov (@nsivov) commented about include/winnt.h:
#define PROCESSOR_OPTIL 18767
#ifdef _WIN64 -#define MAXIMUM_PROCESSORS 64 +#define MAXIMUM_PROCESSORS 512 #else -#define MAXIMUM_PROCESSORS 32 +#define MAXIMUM_PROCESSORS 256 #endif
It's not something you can change, it's a public header.