Nikita Kobzev

Nope. Edge is not responsible for preview. You can check the system registry - the thumbnail handlers are configured there. There should be a key and value ``` [HKEY_CLASSES_ROOT\.webp\ShellEx\{e357fccd-a995-4576-b01f-234630154e96}] @="{C7657C4A-9F68-40fa-A4DF-96BC08EB3551}"...

Here is a registry script that should activate native support of `.webp` if the machine is capable of it. ``` Windows Registry Editor Version 5.00 [-HKEY_CURRENT_USER\SOFTWARE\Classes\.webp] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.webp] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.webp\ShellEx] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.webp\ShellEx\{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}] @="{3F30C968-480A-4C6C-862D-EFC0897BB84B}"...

`IrfanView` - that's another story. That guy must be pulling the blanket over and applying its own configs. If you could provide how the registry for the `.webp` extension looks,...

Seems mostly valid. A silly check then. Is this checkbox enabled? 

I'm running out of ideas. Thumbs cache cleanup? 

Well.. I found a machine with Windows 10 21H1 with native `.webp` support not working - quite like yours. What I did to make things work: 1. Ensured no `WebpPreviewForWindowsExplorer`...