I\'ve got a php script that\'s auto-generating an ics file for a mobile web app.
Using Chrome on my Win7 desktop, the ics file downloads fine, and Outlook likes it.<
most examples I see are in lowercase http://www.w3.org/Protocols/rfc1341/4_Content-Type.html
try making that
Content-Type: text/calendar
not
Content-Type: text/Calendar