Instructions
Navigate to the Desmume website and download the latest version of the DeSmuME emulator. Make sure you always have the most up-to-date version of the emulator for maximum compatibility.
Right click on the file after the download is complete and select the "Extract to..." option. Specify the path where your copy of the emulator is installed as the destination.
Start the emulator. Click "File" and "Open ROM." Select "Iron Man 2" and then click "Open." The game will load and display the title menu.