Copy WII ISO onto a DVD

[libovita02]

Hey guys, This may be a stupid question but I just can not find the answer to it.

I downloaded a few WII games from Internet and they are all ISO files. Then I tried to copy the games on a blank DVD just like copying movies and other ISO files but it does not work. I tried Nero, Alcohol 120, and ImgBurn. Can someone tell me what I did wrong?

Thanks!
P/s:

The error message says "Please insert a rewritable cd into the drive". It is from the burning software. I used Nero to burn other ISOs and I am sure it works. Just not for WII ISOs. I tried to mount this onto a virtual drive and it does not work either. And I tried different dics as well.

This step seems to be so easy but I just don't know what is wrong. Do I need special programs to burn WII isos?