There is no difference for different file extensions. The only difference is the behaviour of the app when you try to open a file that is already open. Shotwell will open another file, while gedit will just say "you have it right here" and give the window/tab with that file focus.
There is no difference for different file extensions. The only difference is the behaviour of the app when you try to open a file that is already open. Shotwell will open another file, while gedit will just say "you have it right here" and give the window/tab with that file focus.