No no no no. You misunderstood me. It's not a file you edit on your ISO image. It's a file AnyDVD HD puts in your My Documents\AnyDVDHD folder for you when you insert a movie. That file can be modified and as long as AnyDVD HD is active will modify it "on the fly". James calls it "magic file replacement" because even though the original is on the ISO, the player will see the one you modify on the hard drive. It's really pretty darn sweet but *ONLY* works with HD DVD and not Blu-ray. But I suspect the subtitle problems you're seeing are only on HD DVD's and not Blu-rays.