Begin with the Infinity Editor; examine the .2da files beginning with "rnd" (like "rndtreas"). Export these and use a hex editor to alter the items listed therein. Save your new .2da file into the "override" folder and the new random item list is ready to go.
I strongly urge you to do much experimentation first before going this route. One false step and you'll likely have to reinstall your BG2 (fortunately, I haven't had to yet).
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An intelligent mind is the key to the universe.
The most distressing thing about practicing magic is the fact that even the most learned sorcerers cannot accurately describe what magic *is*....
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