I have an outlook ICS file. When I open it in Outlook and then double click on any event, sometimes the link show up as a Hyperlink and sometimes it dooes not.

Can anybody please tell me what change I need to make in the format such that the link shows up as Hyperlink in the mail?

The file is here https://drive.google.com/file/d/0B37...it?usp=sharing

Thank in advance.