To fix Canon RAW files (.CR2 or .CR3) not showing up or generating thumbnails in Windows, you need to install the missing camera codec. Because Canon constantly updates its proprietary RAW formats for new camera models, Windows does not natively recognize them without the right plugin. You can fix this issue using the methods detailed below. Method 1: Install the Official Microsoft Codec
This is the fastest method to make Canon RAW images show previews directly inside Windows File Explorer and the default Photos app. Open the Microsoft Store app on your PC. Search for the official Microsoft Raw Image Extension. Click Get / Install. Restart File Explorer or your computer to apply the change. Method 2: Update Your Photo Editing Software
If Windows explorer sees the files but your editing program (like Photoshop or Lightroom) cannot open them, your software’s internal plugin is out of date.
Adobe Camera Raw: Open the Creative Cloud desktop app and update Adobe Camera Raw to the latest version.
Legacy Software Workaround: If you use older, non-subscription software (like Photoshop CS6), it cannot read newer .CR3 files. Download the free Adobe Digital Negative (DNG) Converter to batch-convert your Canon files into widely accepted .DNG raw files. Method 3: Use Canon’s Dedicated Software
If Windows extensions fail to recognize a brand-new camera model, Canon offers its own free processing software.
EOS R6 Mark III Issues with loading RAW files? – Canon Community
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