GIMP 2.8: how to save file using detected image format

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http://unix.stackexchange.com – I found GIMP 2.8 has changed quite a lot, you can't just open the file, modify and save it with CTRL + s anymore, instead, you must use export function, which is CTRL + Shift + e, and select a image format, is there anyway of doing the old stuff ? (HowTos)