A99 and Apple Preview App?
On the Apple platform, the RAW converter is part of the OS. As the other respondent asked: what version of the OS are your running?
Whichever it is, run "Software Update" or go to the App Store and click the "Updates" tab. Install all available updates.
-- Kirby Krieger.
|Nectar Dancing by Lensmate|
from A Big Year - birds
|Sad clown by PEB|
|Mtl Gen X 2015 DP by MarioSS|
from - Gen X - (In Full Colours+ Border)