It appears that Lightroom v4.x is supporting native RAW support for the RX100, but do you have to upgrade to get the codex for that camera? I'm running v3.6 and it appears that I may need to run a full version upgrade to get RAW support for the camera. I don't have CSx so Adobe doesn't seem to let me install Camera RAW 7, which is basically the Lightroom equivalent for Studio.