Unable to open .dng files in Lightroom CC or Lightroom 5.7.1. If I save the file in Lightroom then Lightroom will open the file ok. But if I bring and outside file in from another source, then Lightroom will not recognize the .dng file as a photo file. I may have a problem with my computer. I deleted lightroom and re installed lightroom but still have the same problem. I can open the .dng file up in Photoshop CC and Picasa 3 ok.