Sorry if this is an inane question to ask but I have met with problems in creating Items with the infinity Engine so I have decided to just Edit Existing ones but don't know where the files are inorder to edit them, I assume I need a biff stripper or something to aid me. Can someone point me in the right direction.

The information should be in the "data" directory within the BG2-SOA directory. You will need to extract the data from the .bif files though.