Thumbnail issue

I always disable thumbnails when installing the k lite codec package.
But recently an interesting problem occurred.
If an image and a video are in the same folder, thumbnails are activated.
I have also uninstalled and reinstalled the codec package before but the problem continues.

Which file extension does that video file have?
Try clearing the thumbnail cache with the cleanmgr.exe tool from Windows.

Admin wrote:Which file extension does that video file have?
Try clearing the thumbnail cache with the cleanmgr.exe tool from Windows.

.mp4
file extensions don't matter. it happens to all.
I did that and it didn't work.

Windows Explorer itself is in full control over when it generates thumbnails or not.

It should normally only do it when a thumbnail plugin is active for a file extension. You can check that in the Registry:
HKEY_CLASSES_ROOT\.mp4\ShellEx\{BB2E617C-0920-11D1-9A0B-00C04FC2D6C1}
HKEY_CLASSES_ROOT\.mp4\ShellEx\{E357FCCD-A995-4576-B01F-234630154E96}

Those subkeys should exist only when the thumbnailer is enabled.

You can do a search for {BB2E617C-0920-11D1-9A0B-00C04FC2D6C1} and {E357FCCD-A995-4576-B01F-234630154E96} in the Registry. Maybe they are set elsewhere in an extension related key. Let me know. Don't remove yet until I tell you it is safe.

Yes, they are set elsewhere

Those are not a problem.

Did you restart the computer after cleaning the thumbnail cache? That is usually needed.

well, tbh I don't remember whether I restarted it or I didn't restart it.
Now I did clear the thumbnail cache with the cleanmgr.exe tool again. This time I restarted the computer.
Waiting for the results.

As of right now, there seems to be no problem but let me wait a day or two to be sure.

Admin wrote:Those are not a problem.

Did you restart the computer after cleaning the thumbnail cache? That is usually needed.

Looks good, thanks for the help.