Here, I can prove it - if you download the Adobe DNG Converter and run your Mavic DNGs through it, the converted versions should open fine in Photos and Preview. The fact that that only Adobe products can open the files suggests Adobe goes above and beyond what the format itself calls for. DNG is an open format and when properly written should be openable by any app that supports that format. 'As I checked the RAW on our end, it works well on our PC.
