O.K
I've created a zip file containing the folder and file you'll need to have so Kates fire torpedoes at your sub. There is a read me file and all you'll need to do is put the file and folder in the proper place...and back up the originals of course!
Here's the link:
http://hosted.filefront.com/WolfStar7/
P.S. I've tested this in mp. It should work in offline missions too..I hope.