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    Photo Mechanic is a RAW previewer. When you open a Contact Sheet with RAW, you will see the embedded raw preview. 

    RAW rendering is currently handled through Adobe DNG Converter, which is a free download.

1. Download and install DNG Converter. 
2. Navigate to File>Preferences> Render Cache. 
3. Specify the location of DNG Converter.
4. Check Enable RAW Rendering.