Just a little while ago I was playing and remembered the bug with Lilarcor granting a permanent immunity to icon effect each time it was equipped. I checked my saved games and sure enough Minsc had a gazillion of those effects on him as he was lucky enough not to die since getting the sword.
I decided to go into NI and remove the effects from the saved .cre and noticed something that always bothered me about NI: namely that you can't delete something outright. You have to choose "cut" and just not paste anything.
Anyway, I remembered a faster way to fix the problem (ctrl+y/r Minsc) in-game, so I didn't need NI. Still, the inability to delete things might have been something Jon O. never thought of, and I thought I'd mention it here as you guys are working on new versions of the program.