PortableSunbird ics file using relative paths

Has anyone been able to successfully make a ics file visable in PortableSunbird 0.3 using the Remote WebDAV setting?

I use Rainleader on my USB drive, and currently with version 0.2 it works flawlessly, however with 0.3 it can't seem to get it to work.

My directory structure is R:\PortableAPPS\SunbirdPortable\... (with the rest of the structure in place, as per original).

I've tried file:///../../Data/profile/calendar.ics (where calendar.ics is my file residing in the profile directory), however everytime it says finish, it does not show up, and when i edit the calendar it now reads file:///Data/profile/calendar.ics

I'm stumped. Any help will be much appriciated.

Cheers