How to open any app from standalone iMessage app

If we have a host app, then we can open Safari with openURL method:

[self.extensionContext openURL:[NSURL URLWithString:@"http://google.com"] completionHandler:nil];

But what if we have standalone iMessage app? Is there any trick to open another app from it?

Solution

From the Apple Developer forums, Apple only allows you to open URLs in your parent app (in this case, iMessage for standalone iMessage apps).

I believe to ask for more functionality, file an Apple bug report (feature request).