[Greg]

I try Advanced codecs 64 bit portable latest version on Windows 10, latest update. No thumbnail in File Explorer; tried to turn Icaros thumb-nailing off and back, but no help. How to fix it? Thanks.

[Shark007]

Clear the Windows Thumbnail cache using the Windows provided tool called 'Disk cleanup'
You can find this tool on the Start menu in the folder, Windows Administrative tools

[Greg]

It helped for some file type, e.g. jpg, mkv, not for others, e.g. mp4, ts

[Shark007]

With the folder containing the unthumbed files open,
on the Configure TAB, check the box to disable Icaros and then uncheck it to re-enable Icaros.

[Greg]

Nothing happens, most video file types remain unthumbed.

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Oooops, these file types were not listed in Icaros, I just had to type them in. 

[Shark007]

Try pressing [RESET ALL]
maybe that can fix it for you.

[Greg]

When I realized those file types were not listed I typed there them and this fixed the issue.

Thank you for your replies.

[Shark007]

When I realized those file types were not listed I typed there them and this fixed the issue.

Thank you for your replies.

Thar is exactly why my final suggestion was to use [RESET ALL] because that function would have added all known filetypes to Icaros.