Windows 10: W10 not creating Thumbnails for DNG files

I had an open thread:https://answers.microsoft.com/en-us/windows/forum/windows_10-files/w10-not-adding-thumbnails-to-raw-files-dng/b5a0356e-824d-4d81-8ca2-1bbfc1b05253?messageId=77b07b6e-5e3f-4dd5-bd32-6da0ab13c1b2I was asked to open a new thread.The issue is the same ... DNG files do not show as thumbnails when in 'pictures' folderIn most cases and testing confirms they do have a correct thumbnail if the are on the desktop eg initial import but this is lost and a default icon is then shown when in 'Picture' or any sub folder.Some DNG files do have thumbnails, but vast majority don't.Samp

:)

 

W10 not adding thumbnails to RAW files (DNG)

Win 10 22H2

If I go to a Windows 10 folder - all of the jpeg files have a thumbnail (as do png, tiff etc)
Very few DNG files will have a thumbnail (usually none)
As folders may have hundreds of files - the thumbnail view is essential to quickly find files without having to open everyone.

Sometimes if I keep folder window open (active) for a long time (more than 40 mins) a few of DNG files may change from default icon, to a block of colour then to thumbnail …. Sample pic attached:





I have installed Microsoft raw image Extension .... v3 no difference

I Have followed the steps to use CMD prompt to delete the Thumbnail Cache, increase Cache to 4MB, and restart Explorer to rebuild Cache ... all jpeg thumbnails rebuild (slowly) but not DNG.



Interesting additional observation -

My phone creates DNG files direct .. my camera has to have files converted using Adobe DNG converter.
Just did a test and showed something I had not realised before.

Picture taken with Phone - File saved to Desktop as native DNG ..... and it has the correct thumbnail.

When I move file to a subfolder of My_Pictures it arrives there without a thumbnail, default icon.



Did a 2nd test took RAW picture with my camera - File saved to Desktop as native RW2

Used Adobe DNG Converter to convert RW2 to DNG, File saved to Desktop as DNG … but it does not have a thumbnail. However if I open the file, it then does create a Thumbnail instead of icon.

Again when I move file to a subfolder of My_Pictures it arrives there without a thumbnail, default icon.

 

DNG files not displaying thumbnail

Win 10 22H2 If I go to a Windows 10 folder - all of the jpeg files with have a thumbnail (as do png, tiff etc) Very few DNG files will have a thumbnail (usually none) As folders may have hundreds of files - the thumbnail view is essential to quickly find files without having to open everyone. Sometimes if I keep folder window open (active) for a long time a few of DNG files may change from default icon, but very few - this pic is an example.... the first file was default icon (no thumbnail for over 40 mins ... then finally a thumbnail appeared. I have installed Microsoft raw image Extension .... v3 no difference Have followed the steps to use CMD prompt to kill the thumbnail cache, delete it, and restart Explorer... all jpeg thumbnails rebuild (slowly) but not DNG. Have also followed the tip in folder options - to uncheck 'always shows icons, never thumbnails' The advice is to click on the top button 'apply to folders' but I can't do that as that is greyed out (see pic)

 

W10 not adding thumbnails to RAW files (DNG)

A small % of DNG files did create a Thumbnail ... but not the majority - they now have the default 'hot air balloon icon'

I took new DNG native pic (with phone)

and new RAW image with a camera which I converted to DNG (with ADOBE DNG Converter)

Imported all files to a folder on the desktop ... they ALL had correct thumbnails

When I copy or move these to a folder within 'My Pictures' the Thumbnail is still there.

Previously they were removed, so possibly fixed for new files.

However, the great majority of DNG files in any of the subfolders in My_Pictures do not have a thumbnail and instead have the default 'hot air balloon'

Example pic: all the DNG here were native DNG, a few of these do have Thumbnails - majority don't