PC*MILER is both 32-bit and 64-bit compatible. The build of the software includes both 32 and 64-bit DLLs. These DLLs allow you to use PC*MILER|Connect, TCPIP, Spreadsheets, and BatchPro with either 32 or 64 bit.
There is not an exclusive 64-bit build of the software. When the software is installed in a 64-bit environment, it will be installed with both 32- and 64-bit DLLs.