First, download the USB XTAF Xplorer program. http://www.megaupload.com/?d=I5YNAJLL

Instructions:

You may need to customize your usb for this to work

1. Plug in your USB Drive.
2. Open "USBXTAFGUI"
3. Push "File" -> "OpenDevice"
4. Double Click "0. {dir}Content" and browse to the folder of the file you want to mod. Push "Extract".
Or: Click "0. {dir}Content" and push Extract to extrac all of the files.
5. Browse to where you want to save the contents (Desktop). Keep the name as it is.
6. Find your new file on your desktop or whever you saved it.

Now you can mod a gamesave using Modio or other applications.
You can find what game each folder is with this list. _http://360.kingla.com/
If you're using Modio, just drag the file straight into it.

Once you've modded a file, you can inject it back into the USB Drive:
1. Open "USBXTAFGUI"
2. Browse to the folder where you want to put a file.
3. Delete the old file or gamesave. (Make sure there is a backup saved on your pc first).
4. Push "Inject"
5. Browse to the file (modded gamesave, etc.) and push "Open".
6. You will now see the file in the folder.

Thanks to Scottocs for this part of the guide.

For custom themes

1. Copy a theme (or wallpaper img) from your hdd to your usb stick
2. open it with USB Xtaf Xplorer find the file on your usb in 00030000 folder.
3. Now delete the theme/image you just copied over from your hdd
4. inject your custom them into the folder where you deleted the theme/image.
5. Put the usb back into you xbox and set the theme via profiles, thats it your're all done ;)

nice work.

The USBXTAFGUI is quite a good little app and easy to use.

Originally posted by sicdude:

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The USBXTAFGUI is quite a good little app and easy to use.

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Yeah I need to check it out

Originally posted by keeks750:

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Is there anywhere I can read more about modding the game saves?

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I believe it depends on the games. There is only a small select of games you can mod the saves from what I am aware.

Left 4 dead
COD 5
FFXIII

Originally posted by Scottocs:

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Bitch, you better take off my tut, or give me credit.
http://link removed

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LESS OF THE BITCH, Who the hell do you think you are lol j/k, but seriosly now i was emailed this guide by a friend with a link to pastebin claiming he'd written it himself. There was no info on who posted it so i believed him, i'll give him a slap when i see him.
I've given you credit for the guide now.

EDIT: Also you should take that link down as it leads to a site hosting piracy ;)