blueskirt42: I don't own the version of Indiana Jones and the Fate Of Atlantis sold on GOG, but I am guessing it comes bundled and configured to run on ScummVM, which is a fan made emulating program that allows one to run old adventure games, and primarily old LucasArts adventure games, on countless machines, consoles and phones. ScummVM saves in a different format than the old LucasArts games did back in the day. If your savegames are from the olden days back when computers could run old LucasArts games without the need of emulation, or if your savegames are from a previous time where you ran the game through Dosbox, to load your savegames you will need to run the game through Dosbox, a fan made emulating program that basically emulate an old 486 DOS computer, complete with the: CD <folder>, CD.., DIR/P, etc. of the olden days.

blueskirt42: It's simple really. Basically, you copy the folder of an old DOS game in the Dosbox folder, then you drag and drop the game folder on the Dosbox.exe icon. You will be greeted with a black DOS looking kind of window where the typical DOS commands (CD <folder>, CD.., DIR/P, etc) will work and where you can type the name of a .exe or .bat to launch it, if you're familiar with DOS, this will be super easy, but if you never used DOS before, this might be your biggest hurdle in learning how to use Dosbox.

Other than that, useful keyboard shortcuts are:
CTRL+F12 increases the CPU speed (when a game requires more juice to run fast and smoothly, typically ~8000 cycles is an optimal number)
CTRL+F11 decreases the CPU speed (when a game has timer issues because the CPU is too fast, notably old Sierra point and click adventure games)
ALT+ENTER toggles between fullscreen and windowed modes
And typing EXIT in the DOS prompt will close the program.

Running "DOSBox 0.74 Options.bat" beforehand allows you to tweak many things, it might look scary but in the ten years I've used Dosbox, the only thing I messed in the config was the scaler, aspect ratio and the screen resolution options when I switched to a widescreen monitor.

Dosbox only gets complicated when you attempt to run or install old games that requires a CD to install or play, as these requires a couple of commands to mount a folder as if it was a CD, or when you attempt to run or install through DOS old Windows games.