Photo Mechanic is good about grouping RAW+JPG files and doing the right thing with them when preferences are set correctly - especially using JPEGs for previews and RAWs for editing. Unfortunately, PM doesn't seem to realize that .X3F files from Sigma DP2 Merrill cameras are RAW files, so it ignores them completely and only pays attention to the accompanying JPEG file. In the Finder I have .X3F files set to open in Sigma Photo Pro, one of the few RAW editors than can handle Foveon files. If PM recognized these files it would make a PM workflow much easier for this camera.
Thanks.
-- Roger