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Please mention the exact version of Photoshop you are using and the Camera model in use.
Refer Keeping Photoshop Up-To-Date and manually download the Camera raw Plugin for your version in use
Let us know if that helps
In the Finder, find the ARW file that you described above. Click once on it to select it. Then choose File menu -> Get Info. There is a section in the "Get Info" dialog that says "Open with:". If the popup underneath that is currently set to Preview, instead try setting the popup to "Adobe Photoshop CC 2015". Then click the "Change All..." button underneath that. In the future, double-clicking on these .ARW files should then open them directly in Photoshop, without giving you the message shown above.
I went ahead and did this. Thank you for the suggestion. I also found that I can open PS then drag the selected files in without a problem also.