Tắt thumbnails explorer

1. Disabling thumbnails for all video types

• Disable: regsvr32 /u shmedia.dll
• Enable: regsvr32 shmedia.dll
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• 2. Disabling thumbnails for all image types

• Disable: regsvr32.exe /u shimgvw.dll
• Enable: regsvr32.exe shimgvw.dll

Alternately, you can disable them in RegEdit by clearing (ie, setting the value to blank, empty space) the "(Default)" value on the following key:
HKEY_CLASSES_ROOT\SystemFileAssociations\image\ShellEx\ContextMenuHandlers\ShellImagePreview
For easy restoration, backup (export) the key first, then merge your backup into the registry; or set the value back to its default of "{e84fda7c-1d6a-45f6-b725-cb260c236066}".
(source)

3a. Disabling thumbnails for individual video types

The K-Lite Codec Tweak Tool will conveniently accomplish this. It works by backing up and deleting the following registry key (where .xxx is a file extension):
HKEY_CLASSES_ROOT\.xxx\ShellEx\{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}
Manually removing this key with RegEdit also works; again, export the key first to be able to restore it.

3b. Disabling thumbnails for individual image types

I've tried (in a virtual machine!) deleting all registry keys featuring the string "jpg", to no avail. I don't think it's feasible, short of hex-editing some system DLL.

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