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Delete and rebuild icon cache

taskkill /f /im explorer.exe
del /q/f/s %userprofile%\AppData\Local\Microsoft\Windows\Explorer\iconcache* /a
del /q/f/s %userprofile%\AppData\Local\IconCache.db /a
ie4uinit.exe -ClearIconCache
ie4uinit.exe -show
explorer.exe

Taskbar Tray icon cache:
taskkill /f /im explorer.exe
reg delete "HKCU\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify" /v "PastIconsStream" /f
reg delete "HKCU\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify" /v "IconStreams" /f

del /q/f/s %userprofile%\AppData\Local\IconCache.db /a

taskkill /f /im explorer.exe
del /q/f/s %userprofile%\AppData\Local\Microsoft\Windows\Explorer\iconcache* /a
explorer.exe

ie4uinit.exe -ClearIconCache

Windows 10 taskbar icons:
ie4uinit.exe -show