No other tools are opened. Maybe some illustrations will help to explain what I am talking about:
- before I close Quartus II software I have following files open:
http://i.imgur.com/w8qnpoo.png If I double click on "test1.v" in Project Navigator, this file will get focus in the main window.
- after I close Quartus II software and reopen project, both files seen on image above are still open. But if I double click on "test1.v" in Project Navigator, this file will open one more time:
http://i.imgur.com/fhjrhvx.png So it'll be open twice in the main window, as shown on the image.