After months of broken forum posts and virus-riddled YouTube descriptions, the active, maintained version of the save editor is hosted on and Nexus Mods .

Click File > Open and navigate to your 1.save file. The interface will populate with data.

C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\savegames\[Account_ID]\420 bypass cloud save sync so your edited files don't get overwritten? FC4 Savegame collection - Nexus Mods

Advanced users can open save files (typically save1 or save2 ) in a hex editor to swap data between different save versions or headers.