One of the things we wanted to fix with Fusion 3 is how your games and applications are saved on disk while you’re working on them. Fusion 2.5 uses a “MFA” file, which is a binary file format and only readable by Fusion 2.5 itself. This makes it difficult to use things like version control to track changes to your project, or to manage assets and events in the filesystem.In Fusion 3, we have moved to a completely JSON based approach. This means that you can look at the “source code” of your game or application in any text editor, check it into version control like GitHub, or even write your own tools to work with Fusion 3 projects. Additionally, all of the assets such as images and sounds in your game are saved into a folder along with your project JSON files, which allows you to quickly access your assets and edit them using your own tools.