You can use xdvdmulleter. But note this is a highly risky thing to do as far as potentially getting yourself banned on live goes. Here are the instructions (got them from www.360mods.net):
1. Start XDVDMulleter
2. View ISO Details
3. Choose a Wave 2 Game ISO to extract the (PFI) and (Video Partition)
4. Extract PFI and save it to hard disk.
5. Extract Video Partition File and save it to hard disk
6. View ISO Details with Wave 3 ISO - Select [No] When Asked to try and repair unknown video section.
7. Select (insert video) Under the Video Tab - Select [No] When asked Auto Insert Video.
8. Insert the Wave 2 Video Partition that you saved to your hard disk.
9. Extract DMI under the stealth tab to the same place as PFI and Video Partition.
10. Reboot mulleter and choose Build/Rebuild an ISO
11. Load the Wave 3 image and click Next
12. Choose Create a cloned DVD9 ISO und click next
13. Now choose Load from files and load the (PFI), and (DMI) files you just extracted
14. Click on Make ISO and save it.
15. Under (Other) Tab Select (Make .dvd File) and Save
16. Burn the ISO with the DVD file
done
This post has been edited by jaguar23: Sep 16 2009, 02:11 PM