Open ICS files in Carbonio and add them to the calendar?

When someone sends me an ICS file (calendar invite) as an attachment it sometimes doesn't offer me an option to add it to my calendar.  In that senario I have to download the ICS file and open it with another mail client, Thunderbird with the calendar extension in my case, in order to add it to my (selected) calendar.  This is obviously fairly stupid.  Is there anyway to fix this in Carbonio?