How can I open gliffy diagrams by double clicking?

I installed a program "Gliffy" as a Google Chrome app. It saves it's diagrams as *.gliffy files. I'm wondering if I could set things up so that I can double click on this *.gliffy file and it opens up in the Gliffy editor.

EDIT: I'm using Ubuntu 14.04

EDIT: First step seems to be adding a new mime type for *.gliffy files - https://wiki.archlinux.org/index.php/Default_Applications#Custom_file_associations