ics file not importing into iphone

Hi,
We are using version 3.3.5555.35356 of the MVC scheduler and are having problems importing the ics file into ipads or iphones.
It works fine on android devices and all other machine types. It also works fine in Google calendar and outlook.
One of our users is saying that the file she receives is a txt when exporting from our application using her iphone TO another calendar on the same iphone.

Here is a copy of the ics file.

BEGIN:VCALENDAR
VERSION:3.0
PRODID:Evinto
BEGIN:VEVENT
DTSTART:20160610T100000
DTEND:20160610T110000
SUMMARY:Hearing - Young; Downtown Family Court Center;
DESCRIPTION:
END:VEVENT
END:VCALENDAR

Any help is greatly appreciated.

Andy

Hello,
can you please clarify how exactly do you generate that ics?
I see it specifies version 3.0 -

VERSION:3.0

While I believe it’s usually expected to be 2.0:

VERSION:2.0

ietf.org/rfc/rfc2445.txt - 4.7.4 Version

It is also possible that that particular calendar requires event to have UID property specified:

BEGIN:VEVENT DTSTART:20160610T100000 --> BEGIN:VEVENT UID: 20160610T100000-yourapp.com DTSTART:20160610T100000
Reference
ietf.org/rfc/rfc2445.txt - 4.8.4.7 Unique Identifier