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File with .dng extension cannot be opened in development mode in LR
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Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.
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Try resetting the preferences of Lightroom Classic: https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html
Backup your preferences prior to resetting the preferences:
https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html
If this doesn't help, please give us more informations including the following :
Adobe product and version number
Operating system and version number
The full text of any error message (s)
What you were doing when the problem occurred
Screenshots of the problem and/or error messages
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DNGs from what source? An extension alone doesn't make it a DNG hence the question.