I forgot to say: With Reborn 14.6 it worked perfectly. When I saved the game, the Game.rxdata was stored in den same folder as the Game.exe. So I put the whole Reborn-Folder into Dropbox and it worked perfectly. But now the Save-File isn't called "Game.rxdata" anymore, but (i.e.) "44 - Stoffel - 82h 26m - 12 badges.rxdata". Does it come with Reborn 15 that the Save-Folder can't be changed anymore?
PS: If so, I'd really wish Ame to change the Location of the Save-Files to the Reborn-Folder itself and not to an extrernal Folder. (Or even better: The option to select where the Save-Files should be stored, but this would use a little more effort I think :-) )
UPDATE: I just noticed that on my Windows XP (Yes, I'm still using that old shit) the Save-File ist stored in den same Folder as the Game.exe, but on Windows 10 it's stored in the external Games-Folder.