You need to use a program like Horizon or Modio to extract the SaveGame.sav file first

[zwep]

The error is clear and I know that I should use a program like that.. however, I am on Linux... so I, unless I use Wine, I cannot use those options.

Could you perhaps explain what exactly Modio/Horizon do to the savegame-file? CAN this even be done on a Linux machine? (Given the nature of the program being 'owned' by Microsoft) And then one more question.. if I want to use my newly created SaveGame.sav I need to 'attach' it again to the "original" save-file I guess.. am I required to use a program like Modio/Horizon for that again?