Processing Open Files
If you are processing a file that is already open there are things to consider.
If the new file will have the same name and is saved in the same location, the file will not be saved because it is already open.
If the new file will have the same name and is saved in the same location, and the number of channels changes in the file (mono becomes stereo or vice versa), a new document is created, which is opened in an untitled window.