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In a word processor of mine, I made a save and open feature, but, I'd like to improve my save feature, so that, when the user tries to save, it doesn't make the user choose the location every single time. So I pretty much want my save to do the same thing as MS Word when you try to save.
Well then you simply need to store where the document is located when you open it and then refer to that location when you save it. You could do this by having either a class level or global variable (depends on the design of your code) that just stores this and is updated whenever the user opens a new document.