That's what I did and it worked for PSP games from PSN. I don't have a functional custom bubble yet, but the one I did do didn't do anything differently/worse than before I did that file.
Ok, maybe it's the base game that I'm using. I've used LocoRoco, Ape Quest, and Talkman Tokyo. All of them have the same "can't launch on PSTV error" with my ark bubble or my Initial D Street Stage bubble that I've made with the hackinformer guides.