Hmm. Strange. I have never experienced it. Using the same browser and OS (Firefox on Windows) I can get the DNG without a problem from this post: Revealing more refined details using RT (a random example) – it does have a lower-case extension, though. However, using Chrome (Brave, actually), the link in your post really points at a file with a DNG extension. Weird. @patdavid, any idea?
I didn’t. My target was not to imitate the JPEG with the last Filmic print screen
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Then sorry, my bad: I misunderstood.