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First off, you need to get .ff viewer. Get it
You must login or register to view this content.. Unzip it and then open ffViewer.exe. It should tell you there's an update. You don't need to update, but you can if you want.
Once you open that, you need to get an .ff file from MW3. you can do this by either finding one online, or taking it from your own game. If you get a PS3 .ff file, it wont open. Only PC and Xbox 360 files will open.
When you have an .ff file, to open it, you just click File, then Open FastFile. Then you open the .ff file you have.
Once its open, all the data will most likely be in the Raw files tab. Not all .FF's will have raw data, so if you don't get anything when you load it, it doesn't have any viewable data.
In the Raw files tab, you should see some files. Click on one of them, and you will see the data about it to the right.
Thats it!
Happy Searching!