.ics files displaying as text

I am trying to create "Add to Outlook" links in emails for upcoming events.
I create the meeting request in Outlook. Save it as a .ics file to my
desktop. Then upload it to a SharePoint site. I then use the url for that
uploaded .ics file for the "Add to Outlook" link in the email. (I do not want
to send "meeting requests" as it goes out to a large # of people & not all
will need or want to attend and there is typically a large amount of other
information in the email.) I have one user who when she clicks on the link
the first time, she gets the "text" version of the ics file. If she clicks
again, then she will be prompted to download the ics file. I need to
eliminate that first attempt and just have it download correctly the first
time.

I have tried removing the alarm from the initial meeting request, but she
gets the same behavior. She's using OL 2003 and IE6.

This is what she sees initially after clicking on the link:

BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT

DTSTART:20091209T170000Z
DTEND:20091209T173000Z
TRANSP:OPAQUE
SEQUENCE:0
UID:040000008200E00074C5B7101A82E008000000006057D9 49B378CA010000000000000000100
000003A108E932601D9448B8AB0BF0AC44109
DTSTAMP:20091209T143757Z
SUMMARY:New Test meeting for Connie
PRIORITY:5
X-MICROSOFT-CDO-IMPORTANCE:1
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR