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The AMD64 processors are able to execute 64-bit AMD64 and also 32-bit ia32 programs. Libraries conforming to the Intel386 ABI will live in the normal places like /lib, /usr/lib and /usr/bin. Libraries following the AMD64, will use lib64 subdirectories for the libraries, e.g /lib64 and /usr/lib64. Programs conforming to Intel386 ABI and to the AMD64 ABI will share directories like /usr/bin. In particular, there will be no /bin64 directory.