How do you create a Split gi file?

I have a couple games I want to back up that are more than 4 gb. Yes, I am using Fat32 and would love to make a split GI file so I can back the game up…please tell me how. I already have PxHelper.

okay well, I know split .gi files are possible I have d/l a ton of them. I fixed my problem by installing WinXP and converting one partition to NTFS. I am using that one to back up my games now.