Use a save editor if available (e.g., for Stardew Valley , Cyberpunk , etc.). For unknown games, open the .sav file in HxD – if it starts with PK , it’s a zip file; extract to see XML/JSON.
Steam Emulators trick a game into thinking Steam is running. Saves are often stored in: 5dmcity steamemu saves better
Are you trying to file to a new location or set up a portable game folder? Use a save editor if available (e