Amigo,
The RX100 IS on the list. I don't know what's going on, but I have successfully converted RX100 into DNGs using it (Windows platform, but I don't think that makes a difference). Are you sure you are using it correctly? You select the entire folder of files to convert. Many people have trouble trying to convert one file at a time.
Make sure you are really invoking 7.2. Also, make sure there are only raw files in the folder you select.
New Camera Support
The following new cameras are now supported:
•Canon EOS 650D / Rebel T4i
•Canon EOS M
•Fuji FinePix F800EXR
•Leaf Credo 40
•Leaf Credo 60
•Nikon 1 J2
•Panasonic DMC-FZ200
•Panasonic DMC-G5
•Panasonic DMC-LX7
•Pentax K-30
•Sony DSC-RX100