Compiling a program means to translate your source files into CPU opcodes (and something more, it has to generate a executable image that can work on the OS it was designed for, respecting the OS ABI - Application Binary Interface). Each type of CPU has its own set of opcodes, and even if the Intel x86 architecture has many similarities among 16, 32 and 64 bit opcodes, there are enough differences and the ABI is anyway different. Creating a 64 bit exe/dll means to generate 64 bit opcodes using also the new 64 bit ABI, and to do that a compiler must be written to 'know' them, what a compiler can do is defined by how the compiler itself is written, not by the system it is run on. Delphi 7 compiler 'doesn't know' about 64 bit CPUs and exe/dll ABI, and thereby can't generate it.
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