It can only damage a save file when clicking on 'Save.' Changes in 1.2.1 (Released ):-Quicksaves no longer appear in the drop down list.-Fixed other minor bugs discovered when working on the Fallout New Vegas Save Editor.Every time you save thé game, it produces a new.fos file. AboutFallout 4 save games are usually binary data files making use of the extension.fos. Results 4 Save Sport Binary TemplateA binary design template describing Fallout 4 save game data files (.fos), for use with 010 Editor. Xbox Game Pass for PC (Beta) Xbox Game Pass for PC is a gaming service released by Microsoft in 2019. Download Fallout 2 Save Game Editor for free.