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CR2 thumbnails where. What OS and where Adobe Bridge, Lightroom, Mac Finder, Windows Explorer or file dialogs?
On my windows system I install FastPictureViewer Codec Package to generate Thumbnails for PSD and RAW files.
May I know which operating system are you using?
I am using windows 10 and photoshop 15
Have you installed a windows add on like FastPictureViewer Codec to generate Thumbnails for RAW files? There are other addons besides that one that can do the job.