Outlook vcs format

I am looking for a solution to make vcs file a meeting request insted
of an appointment. Right now the vcs file is as follows:

BEGIN:VCALENDAR
BEGIN:VEVENT
STATUS:TENTATIVE
DTSTART:20101230T033000Z
DTEND:20101230T043000Z
CATEGORIES:MEETING
SUBJECT:Your Proposal Review
DESCRIPTION:Testing
CLASS:PRIVATE
END:VEVENT
END:VCALENDAR

The problem is: it opens as appointment, while my requirement is to
open it as meeting request where I can pass the attendee's email id's.
I am using outlook 2003, but outlook 2007 has similar issue.

Any help will be appriciated.