I didn't found a way to make it work as is.

So finally I implemented an online-save system with an external server, using the newgrounds user-id to authenticate. The game saves a backup of the game-data in the server regularly, and if it founds that there is no local data at start-up, it downloads it from the server.

I didn't found a way to make it work as is.

So finally I implemented an online-save system with an external server, using the newgrounds user-id to authenticate. The game saves a backup of the game-data in the server regularly, and if it founds that there is no local data at start-up, it downloads it from the server.