I see this question have been asked before, but a very long time ago (2006). I did not find a solution to it.
I have a Sony Alpha 100 (a100) and a Sony Alpha 700 (a700). They use a raw file format called ARW. I can see the thumbnails of these images just fine in Photo Mechanic, but I can't view the image, the "icon" for viewing doesn't show.
I have some images from a Canon camera (CR2-files), these open fine.
Is it possible you will support the Sony-files as well? I'd be happy to send you a couple of files (just provide me with an adress to send them to, or upload them to).
Hope for your positive answer.
More information:
OS: Windows XP SP2.
Version of Photo Mechanic: 4.5.3
Amount of RAM: 4GB
Model and make of Camera: Sony Alpha A100 and Sony Alpha A700.
File type: RAW (or .ARW as it is called)