HKEY_CURRENT_USER\Software\Classes\Wow6432Node\CLSID\LocalServer32: this value can have only 16383 characters. If it is longer, the addin is not loaded.
Addin was ignored by Outlook, if application's command line (LocalServer32 entry) was too long. Now, create a BAT file to start the application if the command line is longer than 250 characters.
HKEY_CURRENT_USER\Software\Classes\Wow6432Node\CLSID\LocalServer32: this value can have only 16383 characters. If it is longer, the addin is not loaded.