DNG is the universal camera raw format, that both Lightroom and Photoshop can recognize. There’s a pretty good chance that converting the proprietary camera raw files of a camera manufacturer to DNG, will eliminate the “Preview Unavailable For This File” warning. The update offers some bug fixes and adds the camera raw updates current at that time. If you’ve not updated your original Lightroom 6 to 6.1.4, there are updates and you can find the Lightroom 6 updates here. This was last updated on December 17th, 2017 and there will be no more updates, ever.
The other reason could be that you’re using Lightroom 6, Photoshop CS6 or earlier. Lightroom 6, the last version of Lightroom that was sold as a DVD installation (AKA “perpetual version”). This would be for Creative Cloud apps of Lightroom and Photoshop. 
You usually have to wait for these camera raw updates to be added to the next “dot” version release.
Adobe can’t update a new camera’s updated proprietary raw data the moment it comes out. But first, let’s look at two reasons this could be happening: Library Path: C:\Users\Anders\Pictures\Lightroom\Lightroom Catalog.The Adobe DNG Converter (Mac + PC) may be the solution. Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: NoĪpplication folder: C:\Program Files\Adobe\Adobe Lightroom Maximum thread count used by Camera Raw: 2 Virtual memory used by Lightroom: 302,0 MB Real memory used by Lightroom: 358,3 MB (2,2%) Real memory available to Lightroom: 16262,1 MB Operating system: Windows 8.1 Business Edition Below is the Systeminfo from Lightroom 6.1.1. I use the stand alone (6 not CC) version of Lightroom. Based on this thread I have unistalled C++ and Lightroom, restarted, installed again - but encounter the same problem - I have to launch the program as administrator. 
I am surprised Adobe has not done anything officially about this. Thanks for the link - many report about this problems on many different systems, Mac and PC etc.
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