not sure how much you know about xbox backups but you can't just directly copy xbox games with a pc Pointdablame... You need to FTP to your modded Xbox and rip the files directly from the disk in the xbox. It's not exactly a newbie friendly thing to do.
As for exctracting the files, yea winrar. And I hope you own that game! 
It is not hard at all. If you have passing PC knowledge you can set up FlashFXP or any other FTP program. It takes all of 10 seconds to set up an IP on your PC, and once you are connected it is all drag and drop.
I never understand that statement: "I have the real game, but I just can't back it up myself" No... you don't have the game, so you're downloading it

I've backed up all of my xbox games, and it is very very simple. You can read tutorials all over the web, and if you used something like Slayer's installer, your xbox IP can be set up for you automatically.
I'm not saying it can't be difficult for a newb... but all it takes is a few minutes of reading and playing with your settings.
dskillz has been posting how he got a modded xbox, so he more than likely has dvd2xbox up and running as well as other normal apps a modded system would have.... its simple to do
