How can I compress a file?

I have a game, which an ISO. I need to compress it to be able to fit it on to a DVD disk 4.7GB. The game is 6.2GB atm.
Any ideas?
Thanks
~Karl
Answer #1
Use winrar..Compress to multiple parts…
For example…If you want to compress to 200 MB parts choose this option:

Answer #2
another way:
using UltraIso 9
http://www.google.com?t=1492414&highlight=
this one working perfect. open your *.iso and resave to *.isz
http://filext.com/file-extension/isz this is info about file format.
it’s will very good compress good luck
Answer #3
use KGB Archiver It’ll take hours to compress and you’ll get nice results [ even 50mb ]
Answer #4
I’m trying UltraISO atm, Let’s see how it goes
Answer #5
You can convert the game and install from 2 normal DVDs:
http://www.google.com?t=866964