how to restrict the MIME type in Android Mail client?

Question

I need to open attachment files from the mail client(as loke Outlook) in Android. I use android2.1 Emulator.In the manifest file if i give the <data android:mimeType="*/*" /> i can able to open all the attachment files from my application.But I need to open .ics files only from my application. I try this also <data android:mimeType="text/calendar" /> .But it's not support to open the ics file from my application.How to solve this ? Can anyone guide me to solve this..? It's very urgent So please ....