This usually happens if you downloaded the file via the N73's built-in web browser (Opera Mini or Web). Use a PC to transfer via USB. Alternatively, rename the file to earena.sisx (short names avoid parsing errors).
Multichannel audio system with high quality original soundtrack and plenty of ingame sound effects. Infinite Dreams explode arena sisx n73 new
on your N73 and locate the transferred file. Click install and follow the on-screen instructions. Enjoy the explosions! Tips for Mastering the Arena This usually happens if you downloaded the file