Why an executable program for a specific CPU does not work on Linux and Windows?

Question

An executable problem like exe does not work on Linux (without wine). When compiling source code compiler produce object code which is specific to a particular cpu architect

Answer 1

Yes, but, the code invariably calls out to library functions to do just about anything -- like printing "4" to the terminal. And these libraries are platform-specific, and differ between Linux and Windows. This is why it's not portable -- not, indeed, an instruction-level problem.