Great work. Not nearly as polished as I'd quite expected, but a bit earlier than anticipated too.
Anyway, I have yet to get AO2 to play anything RAR-compressed. I understand there are RAR3 handling bugs, but from what I hear any of those deliver error messages. Any SNES or Gen/MD RARs I've tried thus far, whether via drag-and-drop or File->Open cause AO2 to stall for a second or so and then quit unexpectedly. All files I've tried so far work fine in 1.5.1.
Is this just a potential manifestation of the RAR3 bug, or something that might go away after, say, a reboot, or something odd, perhaps particular to my system, that you could use more detail on?