Burning a non video ISO file

I bought a pc game from Game.co.uk's instant download games section. I would like to backup this game to DVD incase something goes wrong.
I have made an ISO file but that is 7GB and i need to shrink it to 4.7GB. I have DVD shrink but when i try to open the ISO file it says; "Invalid UDF Filesystem"

Please help

Thanks in advance

 

You will have to burn it to a DL disc. Use only Verbatim DVD+R DL 2.4x (MKM-001-00 dye) made in Singapore and burn at 2.4x with ImgBurn.

 

Games are not like movies. You cannot shrink them. They have to remain the same size to work.

 

Ah well that sucks.

 

Here's a possible solution.
Use Winrar to convert the ISO to small RAR files.
Then copy half the RARs to one DVD and the other half to a second DVD.

No need for DVD DL. Of course, this "backup" cannot be run directly,
but one from which the original files can be recreated if need be.

 

Well iv got nothing to lose by zipping it, ill try anything. dont mind it not being bootable i just wanta copy.

Im now using 7-Zip to put it in a zip file so ill see how it all comes out

Thanks for the help everyone