How to inject instructions into an .exe file?

Please understand that this is just experimentation for the heck of it.

Although it is not really a programming question, I would like to know how windows interprets .exe files. I want to know how I can extract instructions from executable X and add them to executable Y (perhaps a pointer in the exe?). So the result would be executable XY, which would first execute instructions from X and then carry on with Y (basically infecting Y with X without making Y disfunctional).

Thanks for the help!


Source: virus

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