Have you tried rebooting yet? Sometimes it takes a reboot, or at least restarting Windows Explorer for the shell extensions to start working. I actually made a script which can force this to update without rebooting, comes in handy sometimes.
Two files, fixShellExtensions.cmd and helper_registerDLLs.cmd. You just run fixShellExtensions.cmd and it will automatically ask for elevated privileges, then at the end you just exit out of the cmd prompt and it restarts Windows Explorer and shell extensions should now work (unless you have Dropbox installed, sometimes those sync icons donβt work).
fixShellExtensions.cmd:
@echo off
:: Register DLL files
start /wait %~dp0\helper_registerDLLs.cmd
:: Restart explorer
taskkill /f /im explorer.exe
start explorer.exe
helper_registerDLLs.cmd:
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:: Elevate.cmd - Version 4
:: Automatically check & get admin rights
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@echo off
CLS
ECHO.
ECHO =============================
ECHO Running Admin shell
ECHO =============================
:init
setlocal DisableDelayedExpansion
set cmdInvoke=1
set winSysFolder=System32
set "batchPath=%~0"
for %%k in (%0) do set batchName=%%~nk
set "vbsGetPrivileges=%temp%\OEgetPriv_%batchName%.vbs"
setlocal EnableDelayedExpansion
:checkPrivileges
NET FILE 1>NUL 2>NUL
if '%errorlevel%' == '0' ( goto gotPrivileges ) else ( goto getPrivileges )
:getPrivileges
if '%1'=='ELEV' (echo ELEV & shift /1 & goto gotPrivileges)
ECHO.
ECHO **************************************
ECHO Invoking UAC for Privilege Escalation
ECHO **************************************
ECHO Set UAC = CreateObject^("Shell.Application"^) > "%vbsGetPrivileges%"
ECHO args = "ELEV " >> "%vbsGetPrivileges%"
ECHO For Each strArg in WScript.Arguments >> "%vbsGetPrivileges%"
ECHO args = args ^& strArg ^& " " >> "%vbsGetPrivileges%"
ECHO Next >> "%vbsGetPrivileges%"
if '%cmdInvoke%'=='1' goto InvokeCmd
ECHO UAC.ShellExecute "!batchPath!", args, "", "runas", 1 >> "%vbsGetPrivileges%"
goto ExecElevation
:InvokeCmd
ECHO args = "/c """ + "!batchPath!" + """ " + args >> "%vbsGetPrivileges%"
ECHO UAC.ShellExecute "%SystemRoot%\%winSysFolder%\cmd.exe", args, "", "runas", 1 >> "%vbsGetPrivileges%"
:ExecElevation
"%SystemRoot%\%winSysFolder%\WScript.exe" "%vbsGetPrivileges%" %*
exit /B
:gotPrivileges
setlocal & cd /d %~dp0
if '%1'=='ELEV' (del "%vbsGetPrivileges%" 1>nul 2>nul & shift /1)
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::START
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REM Run shell as admin (example) - put here code as you like
regsvr32.exe "C:\Program Files (x86)\Nextcloud\shellext\OCContextMenu_x64.dll"
regsvr32.exe "C:\Program Files (x86)\Nextcloud\shellext\OCOverlays_x64.dll"