Well, to edit a program that is already compiled (like an exe), you would use ReadFile, WriteFile, ReadByte, WriteByte, etc.
Of course, if the pre-patched and post-patched file sizes are different (like if you changed the code and re-compiled), it makes it considerably harder. But if you're just editing string tables (like for a language hack) or something, I don't see a reason why you can't use this method.
Of course, if the pre-patched and post-patched file sizes are different (like if you changed the code and re-compiled), it makes it considerably harder. But if you're just editing string tables (like for a language hack) or something, I don't see a reason why you can't use this method.