iso too big

Hi, I was sent an iso game file but it is too big to go onto a dvd. It is 5.5 instead of 4.7. Is there any way to shrink it.
I am running windows 7, I have tried to mount it instead of burning it but windows 7 wont allow me to use any of my mounting programs I used to use with XP. So is there any way to put this onto a dvd-r

 

Virtual CloneDrive is listed as Win7 compatible.

http://www.slysoft.com/en/virtual-clonedrive.html

 

TRY:
Doubble Clicking the file, till is mount it.....will do the trick.

Good luck.