Tired of casting the ALT + ENTER fullscreen spell at every scene change in MTG Arena on your ultrawide display? This tray script finally breaks the years-long ultrawide bug curse Wizards forgot to unsummon.

This was crafted for GitHub’s For the Love of Code hackathon using GitHub Copilot, Claude Sonnet 4, and a +1/+1 token of stubbornness.

I usually conjure spells on macOS and Linux, but this Windows build is my first summoning in that domain. If you see bugs, send word to the council (open an issue).

Quick install: Navigate to Releases and download the latest MTGAFullscreenHelper-Setup.exe. Double-click. Install. Magic.

Enjoy MTG Arena on your ultrawides again 🤩

• System Tray Application: Runs in background with no visible window
• Automatic Detection: Monitors MTGA window state every second (configurable)
• Automatic Restoration: Sends ALT+ENTER when windowed mode is detected
• Configurable Settings: Customize via config.json
• Simple Controls: Right-click tray icon to toggle active/inactive or quit

• Windows 10/11
• .NET 6.0 Runtime or later
• Magic: The Gathering Arena

1. Download the latest installer (MTGAFullscreenHelper-Setup.exe) from the Releases page
2. Run the installer and follow the setup wizard
3. (Optional) Choose to create a desktop shortcut or enable auto-start
4. Launch MTGA Fullscreen Helper from the Start Menu or desktop icon

1. Install .NET 6 SDK
2. Clone or download this repository
3. Open terminal in the project folder
4. Run:

   dotnet build --configuration Release

5. Find the built executable in bin\Release\net6.0-windows\

1. Start the application: Double-click MTGAFullscreenHelper.exe or run from command line
2. Tray icon appears: Look for the application icon in your system tray (notification area)
3. Automatic monitoring: The app will check MTGA's window state every second
4. Right-click menu:
   • Toggle Active: Pause/resume monitoring
   • Reset Counter: Reset the fullscreen restoration count to zero
   • Quit: Exit the application

Edit config.json to customize settings:

{
  "WindowTitle": "MTGA",
  "Executable": "MTGA.exe", 
  "CheckIntervalMs": 1000
}

• WindowTitle: The exact window title to look for (MTGA's default)
• Executable: Process name (not currently used, reserved for future features)
• CheckIntervalMs: How often to check window state in milliseconds

• Make sure MTGA is running and the window title matches the config
• Try running as administrator for better process access

• Ensure the app has permission to send keystrokes to other applications
• Run as administrator
• Check that MTGA accepts Alt+Enter for fullscreen toggle

• Check the system tray overflow area (click the up arrow in tray)
• Restart the application

• The counter may increment rapidly if the window title doesn't match exactly
• Use "Reset Counter" from the right-click menu to start fresh
• Try pausing the app, starting MTGA, waiting for it to go fullscreen, then reactivating

• Built with .NET 6 Windows Forms
• Uses Win32 APIs for window detection
• Timer-based monitoring with configurable intervals
• Cross-process keystroke simulation via SendKeys

This project is licensed under the MIT License - see the LICENSE file for details.

Issues and pull requests are welcome!