I believe PureRaw WON’T process a DNG file if it has previously been processed in any other photo-editing application. You will see the dreaded “can’t process, or corrupted” message. Footnote: I do not use LR, but have in the past. I wanted to re-process several DNG files that were previously processed in LR, and still preserved the DNG file type, and PR wouldn’t process them. See my posts on the subject of “can’t process/or corrupted” files.