Topic on Talk:Atomic Heart
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The location of the save data in the gamepass version is %LOCALAPPDATA%\Packages\FocusHomeInteractiveSA.579645D26CFD_4hny5m903y3g0\SystemAppData\wgs\000901F2D2B88B76_0000000000000000000000006113CEB0 In each randomly named folder, there is a file with no extension, so if you name the file something like 0.sav, 1.sav, it might work for the Steam version.