If this is a custom level or modified save file ("Day 6b"), it likely contains:
Here is potential content based on common contexts for such a file: 🚀 About Moving Out MovingOut-Day-6b-mac.zip
Unzip the MovingOut-Day-6b-mac.zip file (usually by double-clicking). If this is a custom level or modified
Chaotic couch co-op physics-based moving simulator. MovingOut-Day-6b-mac.zip
A progress file skipping to a specific point in the game. App Wrapper: A packaged version of the game for macOS. 🛠️ How to Use (macOS)
If you can tell me where you downloaded this file or what it is for, I can provide more specific instructions on: How to actually play it. Troubleshooting: What to do if the Mac app fails to launch.