okay, i have just tried using the save file editor and modified the save files of the game. i have overwritten the new files with the old ones but whenever i launch the game, the save files just revert to what they were previously

Hey !

Test this :

-Go to One-Armed Robber on your Steam's library, go into settings --> Property --> Updates. Check if that auto-update is off. De-activating Steam Cloud in "General" settings may also work.

=> If this doesn't work, just try putting the file in the OAR folder again, and restarting. Hope this help !