Debug.txt

[HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\<version>\General] "EnableVSIPLogging"=dword:00000001

Then using Ctrl-Shift, click on a menu item and you'll get a message like this:

C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\devenv.exe
/rootsuffix Exp

C:\Program Files (x86)\Microsoft Visual Studio 8\Common7\IDE\devenv.exe
 /rootSuffix Exp

rem $(ProjectDir)7za a -y -tzip "%SOLUTION_DIR%\Installers\%SOLUTION_NAME%.zip" "CodeBeautifier\*.dll" "%PROJECT_DIR%\CodeBeautifier.AddIn"

Arid made one little mistake with the path of the file. The correct path has
"microsoft" before "Visual Studio", so it is
%APPDATA%\Microsoft\VisualStudio\8.0\1033\CmdUI.prf
perhaps you might find the file there too.

VS2019

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\devenv.exe
C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\Common7\IDE\devenv.exe
/rootsuffix Exp

VS2022

C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\devenv.exe
/rootsuffix Exp