Can't open photos Sigma Photo Pro 5.3

Hi all, I m new to Sigma cameras. Just got the DP2M. However when I try to download photos to my Mac the photos open in my Fujifilm Finepix viewer and cant get them to open in Sigma Photo Pro which I just downloaded. I can download the JPEG's but not RAW in Finepix. I think this may just be a set up issue. Any idea how to get the photos to open in the right program?

Thanks.