Total Commander

Where can I check if the "copy hook handler" is installed?

You can use the same tool ShellExView, just sort by type of handler.

Yes, "copy hook handler" is in the list. Dropbox copy hook handler Is disabled in ShellExView.

There are other "Copy hook handlers" in the list:


Shell Copy Hook No Copy Hook Handler Windows Shell Common Dll 10.0.22621.1635 (WinBuild.160101.0800) Operační systém Microsoft® Windows® Microsoft Corporation No No No No No No C:\WINDOWS\system32\shell32.dll {217FC9C0-3AEA-1069-A2DB-08002B30309D} 02.05.2023 5:37:00 07.05.2022 7:28:00 Yes Directory A 8 418 288 No Microsoft Windows No

and

Shell extensions for sharing No Copy Hook Handler Shell extensions for sharing 10.0.22621.1635 (WinBuild.160101.0800) Operační systém Microsoft® Windows® Microsoft Corporation No No No No No No C:\WINDOWS\system32\ntshrui.dll {40dd6e20-7c17-11ce-a804-00aa003ca9f6} 02.05.2023 5:37:00 07.05.2022 7:28:00 Yes Directory A 581 632 No No

You can try to disable them temporarily to check whether one of them is the culprit, but they are probably not.