Assegnate 5 su 5 stelle

I love this Add-on, using it since forever. However, on Windows 8.1 x64, the first time I download something in a new session, the download fails (<file> could not be opened, because the associated helper application does not exist. Change the association in your preferences.). Happens for random files. Could you please fix this?

Edit: fiddled around with the extensions. Can't really find the culprit, but after reinstalling some stuff it works perfectly now. You're add-on deserves all the five stars!

Questa recensione riguarda una versione precedente (3.5.1.1-signed) del componente aggiuntivo. 

Uhm... any other extensions?