This evening I've downloaded Visual Basic 2005 Express Edition and Visual Web Developer 2005 Express Edition with the intention to burn a CD for a future installation.
Here the surprise... I've downloaded the image (.img) file (located here), opened my Nero Burning Rom 6.0 but, when trying to burn the image, I've found a problem: Nero 6 seems not to recognize the image. I had a minute of panic... 
Why this? I need a solution. So, I've tryed one of the most professional way to solve this problem (no, not rewriting every bit of the header file 
): renaming the file from .IMG to .ISO and load it into Nero Burning Rom.
Result? Now I've my Visual Studio 2005 Express Edition CDs on my bag ready to be used. 
If you have my same problem, now you know what you have to do.