NOTE:you cannot mod all games.. Only you can mod games which are available on pc and xbox one both.. ~you need a pc and xbox one.. ~for example you need to mod save game for forza horizon 4..first you gonna download forza 4 on you pc and you can easily mod forza 4 using cheat engine etc.. ~then you need to upload that game save to cloud ~and download save on you xbox one ~and now you have a modded savegame.