I can still run my old executables that I compiled back in 2002 and 2003 on my current Windows computers. I don't think I could do that with anything that was

I can still run my old executables that I compiled back in 2002 and 2003 on my current Windows computers. I don't think I could do that with anything that was compiled for Linux or MacOS back then. I wouldn't want to do that with anything that opens ports on my computer that was compiled back then.